## Proportion

### A proportion is a statement that two ratios or fractions are equal

A proportion is a statement that two ratios or fractions are equal. It represents the equality between two ratios or fractions and is often expressed using the symbol “=”. In a proportion, the ratios are formed by comparing corresponding parts of different quantities.

Proportions are commonly used in various mathematical applications such as solving problems involving similarity, scaling, and scaling factors. They can be used to find unknown values, compare quantities, or make predictions.

A proportion can be written in the form of:

a/b = c/d

Here, a and c represent the corresponding terms of the first ratio, while b and d represent the corresponding terms of the second ratio.

To solve a proportion, you can use a cross-multiplication method. Let’s say we have the proportion:

a/b = c/d

To solve for the missing value, you can cross-multiply:

ad = bc

Then, you can solve for the missing value by dividing both sides of the equation by the coefficient:

x = (bc) / a

This allows you to find the value of the missing term in the proportion.

For example, let’s say we have the proportion:

2/3 = 4/x

To find the unknown value x, we can cross-multiply:

2x = 4 * 3

Simplifying, we get:

2x = 12

Dividing both sides by 2, we find:

x = 6

Therefore, the missing value in the proportion is 6.

Proportions are also useful for solving problems involving scaling or finding missing parts of similar figures. By setting up and solving proportions, you can determine dimensions, lengths, or areas of figures that are similar to each other.

Overall, proportions are a fundamental concept in mathematics that help us compare and relate different quantities and find unknown values based on the equality of ratios.

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