Ratios, rates and proportions allow us to compare quantities. For example, you need to mix different colours of paint in a specific ratio to get a desired colour. When we say we are driving 100 kilometers per hour, that is an example of a rate. If two rates or ratios are equivalent to one another it is called a proportion. Proportions can be used to solve for unknown values and have several applications, including unit conversions and dosage calculations. In this module, you will review how to use ratios, rates, and proportions to solve real-life problems.