A proportion is simply a statement that two ratios are equal. In problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. To find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.
Consider given proportion
[tex]\dfrac{2}{3}=\dfrac{20}{30}.[/tex]
Here, 2 and 30 are the extremes and 3 and 20 are the means.
Answer: the means are 3 and 20.
