- Solve proportions
A proportion is an equation that states two ratios are equal:
[latex]\frac{a}{b} = \frac{c}{d}[/latex]
To solve a proportion, use cross multiplication:
[latex]a \times d = b \times c[/latex]
Solve for [latex]x[/latex]:
[latex]\frac{x}{5} = \frac{6}{10}[/latex]
[latex]\begin{align} x \times 10 &= 5 \times 6 \\ 10x &= 30 \\ x &= 3 \end{align}[/latex]