Question

If 14 is the mean proportion between x and 28; find the value of x.

• A. 7
• B. 8
• C. 4
• D. 5

Answer 1

The correct option is A 7

Mean proportional of two numbers, $a$ and $b$ is $\sqrt{ab}$
Given, mean proportional of $x,28$ is $14$.

$=>\sqrt{x\times 28}=14$

$x\times 28={14}^2$

$x=7$