Question
$$\frac{3}{4} = \frac{15}{d}$$
Answer
$$ d = 20 $$
Explanation
$$ \begin{aligned} \frac{3}{4} &= \frac{15}{d}&& \text{multiply ALL terms by } \color{blue}{ 4d }. \\[1 em]4d\cdot\frac{3}{4} &= 4d\cdot\frac{15}{d}&& \text{cancel out the denominators} \\[1 em]3d &= 60&& \text{ divide both sides by $ 3 $ } \\[1 em]d &= \frac{60}{3}&& \\[1 em]d &= 20&& \\[1 em] \end{aligned} $$
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