Question
If $b : a = c : d$, then $a, b, c, d$ are in proportion.
✓
Answer
If $b : a = c : d$
$\Rightarrow \frac{\text{b}}{\text{a}}=\frac{\text{c}}{\text{d}}$
If a, to, c and d are in proportion, then
$\frac{\text{a}}{\text{b}}=\frac{\text{c}}{\text{d}}$
$= ad : bc$
$\Rightarrow \frac{\text{b}}{\text{a}}=\frac{\text{c}}{\text{d}}$
If a, to, c and d are in proportion, then
$\frac{\text{a}}{\text{b}}=\frac{\text{c}}{\text{d}}$
$= ad : bc$
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