Question

Find the value of $x$, if the following is in proportion: $9,x,12,8$.

Answer 1

Find the value of $x$:

Since $9,x,12,8$ are in proportion,

So, $9:x::12:8$

$\Rightarrow \frac{9}{x}=\frac{12}{8}$

$\Rightarrow 12x=9\times 8$

$\Rightarrow x=\frac{9\times 8}{12}$

$\Rightarrow x=6$

Hence, the value of $x$ is 6.