| William Chauvenet - 1872 - 382 páginas
...means are equal, as in the proportion a : b = b : c, we have 6 a = ac, whence 6 = \/ac ; that is, a mean proportional between two numbers is equal to the square root of their product. 6. Conversely, if the product of two numbers is equal to the product of two others, either two may... | |
| W. P. Higgs - 1876 - 122 páginas
...divide by the first, to find the fourth term, or the answer. In arithmetic, too, we are told that " the mean proportional between two numbers is equal to the square root of their product." The reason we may perceive from the following proportion : a : b : : b : c Here b is what is termed... | |
| Henry Bartlett Maglathlin - 1882 - 320 páginas
...proportional between the extremes of a proportion is one of the equal means of the proportion (Art. 346), the mean proportional between two numbers is equal to the square root of their product. Hence, Л/816 X 97J = -v/79560 = 282.0638+, Ans. 75. r Ib. = 12 oz. ; 12 oz. : oz. = $- : x , Ans'... | |
| William Chauvenet, William Elwood Byerly - 1887 - 342 páginas
...proportion a : b = b : c, we have 6* = ac, whence b = y^ac; that is, a mean proportional (II., 36) between two numbers is equal to the square root of their product. 6. Conversely, if the product of two numbers is equal to the product of two others, either two may... | |
| William Chauvenet, William Elwood Byerly - 1887 - 331 páginas
...proportion a : b = b : c, we have 6 2 == ac, whence b = y^ac; that is, a mean proportional (II., 36) between two numbers is equal to the square root of their product. 6, Conversely, if the product of two numbers is equal to the product of two others, either two may... | |
| George W. Lilley - 1892 - 420 páginas
...: с Let e : 6 :: b : c. Therefore I., ft2 = ac. Extract the square root, b = ^/a c. Hence, III. A mean proportional between two numbers is equal to the square root of their product. Let a:b::c:d. Therefore I., ad — be. ab Divide bv с d, - = -• с d IV. If four numbers are in... | |
| Webster Wells - 1893 - 382 páginas
...square of the mean proportional between two numbers is equal to the product of the numbers. Hence, the mean proportional between two numbers is equal to the square root of their product. EXAMPLES. 270. 1. Find a fourth proportional to 7, 10, and 21." By Art. 268, the required fourth proportional... | |
| John Henry Walsh - 1893 - 426 páginas
...first = 3 X 3 sq. ft. ; of second, 5 x 5 sq. ft. ; of third, V9 x 25 sq. ft. = 15 sq. ft. NOTE. — The mean proportional between two numbers is equal to the square root of their product. 13. Find the volume of the frustum of a square pyramid, its upper base containing 64 square inches,... | |
| William Chauvenet - 1893 - 340 páginas
...the proportion a : b = b : c, we have & = ac, whence 6 = \/ac; that is, a mean proportional (II., 36) between two numbers is equal to the square root of their product. 6. Conversely, if the product of two numbers is equal to the product of two others, either two may... | |
| George P. Lilley - 1894 - 522 páginas
...: Ъ :: Ь : с. 4 Therefore I., l'¿ = nc. Extract the square root, Ъ = -у/а с. Hence, III. A mean proportional between two numbers is equal to the square root of their product. Let a : 6 : : с : d. Therefore I., ad = be. а Ъ Divide by с d, - = -5 • IV. If four numbers are,... | |
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