Question

Mean proportional of 25 and 64 is 40.

• A. True
• B. False

Answer 1

The correct option is A

True

Mean proportional (b) = $\pm \sqrt{ac}$
Here, a = 25 c = 64
$b=\sqrt{25\times 64}=\sqrt{5^2\times 8^2}=5\times 8b=\pm 40$
So, the statement of b being equal to 40 is true.