Question

$12,14,9$ and ____ are in proportion.

Answer 1

Assume $12,14,9$ and $x$ are in proportion.

Since the given terms are in proportion.

Therefore,

$$\begin{gathered} \frac{12}{14}=\frac{9}{x} \\ x=\frac{9\times 14}{12} \\ x=10.5 \end{gathered}$$

Hence, $12,14,9$ and $10.5$ are in proportion.