A proportion is a statement that two ratios are equal. It consists of two fractions, where the cross products are equal, meaning that the product of the means equals the product of the extremes.
For example, the proportion \( \frac{a}{b} = \frac{c}{d} \) can be expressed with specific values, such as \( \frac{2}{4} = \frac{1}{2} \). In this case, both fractions simplify to 0.5, demonstrating that they represent the same relationship.