# How do you complete the proportion 4/5=x/15?

Jan 13, 2017

Multiply each side of the equation by $15$ to find $x$. See full process below:

#### Explanation:

Multiply each side of the equation by $\textcolor{red}{15}$ to find $x$.

$\textcolor{red}{15} \times \frac{4}{5} = \textcolor{red}{15} \times \frac{x}{15}$

$\frac{60}{5} = \cancel{\textcolor{red}{15}} \times \frac{x}{\textcolor{red}{\cancel{\textcolor{b l a c k}{15}}}}$

$12 = x$

Substituting $12$ for $x$ gives:

$\frac{4}{5} = \frac{12}{15}$