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The mean proportional between two number...

The mean proportional between two numbers is 56. If the third proportional of the same two numbers is 448, then find the sum of the two numbers.

A

180

B

440

C

240

D

140

Text Solution

Verified by Experts

The correct Answer is:
D
(i) If `b^(2) = ac`, then b is the mean proportional and c is the third proportional.
(ii) Let the two numbers be a and b .
(iii) ab = ` (56)^(2)`.
(iv) ` b^(2)=448a`.
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