Question

If $9,18,x$ and $8$ are in proportion, then $x=\_\_\_\_$ $\left[x=4/x=12\right]$

Answer 1

Since $9,8,x$ and $8$ are in proportion.

Therefore,

$$\begin{gathered} \frac{9}{18}=\frac{x}{8} \\ x=\frac{9\times 8}{18} \\ x=4 \end{gathered}$$

Hence, the value of $x=9$