Question

Find x if 4, 8, 6, 0, x and 8.5 are in proportion.

Answer 1

$$\begin{gathered} \mathrm{It}\mathrm{is}\mathrm{given}\mathrm{that}4.8,6.0,x\mathrm{and}8.5\mathrm{are}\mathrm{in}\mathrm{proportion}. \\ \therefore \frac{4.8}{6.0}=\frac{x}{8.5} \end{gathered}$$

$\Rightarrow x=\frac{4.8\times 8.5}{6.0}$

$\Rightarrow x=6.8$