Question
$$\frac{15}{20} = \frac{30}{x}$$
Answer
$$ x = 40 $$
Explanation
$$ \begin{aligned} \frac{15}{20} &= \frac{30}{x}&& \text{multiply ALL terms by } \color{blue}{ 20x }. \\[1 em]20x\cdot\frac{15}{20} &= 20x\cdot\frac{30}{x}&& \text{cancel out the denominators} \\[1 em]15x &= 600&& \text{ divide both sides by $ 15 $ } \\[1 em]x &= \frac{600}{15}&& \\[1 em]x &= 40&& \\[1 em] \end{aligned} $$
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