Скачать или смотреть How to Solve Proportions

Learn how to solve proportions. For example, how do you solve x/5 = 12/15
I cover the steps and then work an example problem.
Here is some additional information on proportions

Proportions
Definition: A proportion is an equation stating that two ratios are equal.
Form: a:b = c:d
Example: 2:3 = 4:6
Properties:
The product of the means equals the product of the extremes.
If two means or two extremes are equal, then the other two means or extremes are equal.
If three terms of a proportion are equal, then the fourth term is also equal.
Applications:
Proportions can be used to solve a variety of problems, such as:
Finding the value of a missing term
Comparing two ratios
Determining whether a given ratio is in proportion
Scaling a recipe or image