Question

If the first three terms of proportion are $9$, $8$ and $54$ respectively, find the fourth term.

Answer 1

Let $x$ be the fourth term

$\Rightarrow 9:8=54:x$

$\Rightarrow \frac{9}{8}=\frac{54}{x}$

$\Rightarrow x=54\times \frac{8}{9}=48$

$\therefore$the fourth term is $48$