Ratio and Proportion

Ratio and proportion are important concepts in mathematics that involve comparing quantities and establishing relationships between them. They have many practical applications in various fields. 


Definition: A ratio is a comparison of two quantities or numbers by division. Ratios are typically expressed in the form a:b or a/b, where "a" and "b" are two numbers. For example, a ratio of 2:3 means that for every 2 units of one quantity, there are 3 units of another quantity.

Simplifying Ratios: Ratios can be simplified by dividing both parts by their greatest common factor. For example, the ratio 6:8 can be simplified to 3:4 by dividing both 6 and 8 by 2, which is their greatest common factor.


Definition: A proportion is an equation that states that two ratios are equal. Proportions are often used to solve problems involving an unknown quantity, where you can set up a proportion and solve for the missing value.

Proportion Example: If you have a proportion 2/3 = x/9, you can cross-multiply and solve for "x" to find that x = 6.

Equivalent Ratios:

Ratios that have the same value are considered equivalent. You can find equivalent ratios by multiplying or dividing both parts of a ratio by the same number. For example, the ratios 2:3 and 4:6 are equivalent because you can obtain the second ratio by multiplying both parts of the first ratio by 2.

Direct and Inverse Proportions:

Practical Applications:

Ratios and proportions have numerous real-life applications, including:

Practice and Problem Solving:

Solving problems involving ratios and proportions often requires setting up equations and solving for unknown values. Regular practice is essential to master these skills and apply them in various situations.

Understanding ratios and proportions is important in both mathematics and everyday life, as they allow you to compare quantities and solve a wide range of practical problems.