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Ratio and

Proportion

Ratio

Ratio is a mathematical term used for comparing

the size of one part to another part.

Ratios are usually shown as two or more numbers

separated with a colon, for example, 7:5, 1:8 or 5:2:1

So 1-out-of-3 is equal to 2-out-of-6

The ratios are the same, so they are in proportion.

Example:

International paper sizes (like A3, A4, A5, etc) all have the

same proportions:

Direct Proportion

As one amount increases, another amount increases at
the same rate.

Inverse Proportion

When one value decreases at the same rate that the

other increases.

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