Percent Proportions

A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.

To convert a fraction to a percent, divide the numerator by the denominator and then multiply by 100.

The formula is: Percent of a number = (Percent / 100) * Number.

The number is 200, because 50 = (25/100) * Number.

Percent increase measures how much a quantity has grown relative to its original amount, calculated as: ((New Value - Original Value) / Original Value) * 100.

Percent decrease measures how much a quantity has shrunk relative to its original amount, calculated as: ((Original Value - New Value) / Original Value) * 100.

Total Amount = Part / (Percent / 100).

A proportion is an equation that states that two ratios are equal.

You can set up a proportion by creating a ratio from the known values and setting it equal to a ratio that includes the unknown.

To convert a percent to a decimal, divide by 100. For example, 25% = 0.25.