Question

Find $$x$$, when $$x : 1.5 :: 3 : 5$$.

Answer 1

We use the property: $$\text{Product of extremes} = \text{Product of means}$$.

$$x \times 5 = 1.5 \times 3$$

$$5x = 4.5$$

$$x = \frac{4.5}{5} = 0.9$$