a/b = c/d is one possible form.
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proportion
An Equation is a number sentence stating that two amounts are equal
Propotion
An equation that sets two fractions equal to each other is called a proportion. In a proportion, the cross products of the fractions are equal. For example, if you have the proportion ( \frac{a}{b} = \frac{c}{d} ), then ( ad = bc ). Proportions are commonly used in solving problems involving ratios and rates.
They are called equivalent fractions.