Question

Why do we use ratio and proportion

Answer 1

Ratios are used to compare values. They tell us how much of one thing there is compared to anothe

example
For example, ratios can be used to compare the number of girl puppies to boy puppies that were born. If we have a total of six puppies, where two are girls and four are boys, we can write that in ratio form as 2:4 (girls:boys).

Proportions are related to ratios in that they tell you when two ratios are equal to each other


example
Our first ratio of girls to boys is 2:4 for our litter of six. If our next litter had a ratio of 4:8 of girls to boys, it would be proportional to our first litter; because if we divide each of our ratios, we will find that they are equal: 2 / 4 = 0.5 and 4 / 8 = 0.5, as well.