# Mean Proportional

## Mean Proportional

In a proportion with three terms, the mean term is the mean proportional between the two other terms.

The expression “mean proportional” is a synonym of “geometric mean“.

### Example

Consider this proportion:

$$\dfrac{2}{x}$$ = $$\dfrac{x}{8}$$

The term $$x$$ is a mean proportional.

We can calculate it with the geometric mean :

$$\overline{x}_g$$ = $$\sqrt[2]{2 × 8}$$ = $$\sqrt[2]{16} = 4$$