Question

What would be the mean proportion of 25 and 400 ?

Answer 1

Mean Proportion of 2 numbers a and b is :
$\frac{a}{x}=\frac{x}{b}$
Thus, $x^2=ab$
Thus x= $\sqrt{ab}$ = $\sqrt{25\times 400}$ = 5 $\times$ 20= 100
Thus, the mean proportion of 25 and 400 is 100.