A proportion is an equation stating that two ratios are equal (two equivalent fractions)
Finding the missing value in a proportion means finding the missing value for two equivalent fractions.
There are three ways to solve proportions
Method 1: Vertical
Method 2: Horizontal
Method 3: Cross-products
Cross multiply and solve for X.
The missing value is 30.
Solving Proportions by Cross Multiplication
In an proportional relationship such as
we can multiply the numerator of each side by the denominator of the other side.
The cross products of a proportion are equal. This property help us solve for an unknown value.
Solving proportions worksheets with an unknown variable (using only integers):
Solving proportions worksheets with an unknown variable (with one decimal):
If one term of a proportion is not known, we can use cross multiplication to find its value.