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$$\frac {a}{b} = \frac {c}{d}\Rightarrow a=\frac {b \times c}{d}$$

$$\frac {a}{b} = \frac {c}{d}\Rightarrow b=\frac {a \times d}{c}$$

$$\frac {a}{b} = \frac {c}{d}\Rightarrow c=\frac {a \times d}{b}$$

$$\frac {a}{b} = \frac {c}{d}\Rightarrow d=\frac {b \times c}{a}$$