Question

Mean proportion of 64 and 225 will be -

• A. 120
• B. 90
• C. 60
• D. 30

Answer 1

The correct option is A 120

Consider given the numbers $64$ and $225$

Let, the mean proportional be $x$

Therefore $64,x,225$ are in proportion

We know that product of means is equal to product of extremes

Hence,

$x^2=225\times 64$
$x=\sqrt{225}\times \sqrt{64}$
$x=15\times 8=120$

Hence, this is the answer.