Question

Find the third proportional
$36,18$

Answer 1

Let the required third proportional be $x$

$\therefore 36,18,x$ are in continued proportion.

$\Rightarrow 36:18=18:x$

$\Rightarrow \frac{36}{18}=\frac{18}{x}$

$\Rightarrow x=\frac{18\times 18}{36}=9$

$\therefore$ Required proportional$=9$