### What is *proportions*?

### What is *proportions*?

- A part or amount considered in relation to a whole: What is the proportion of helium in the atmosphere?
- A relationship between things or parts of things with respect to comparative magnitude, quantity, or degree: the proper proportion between oil and vinegar in the dressing.
- A relationship between quantities such that if one varies then another varies in a manner dependent on the first:"We do not always find visible happiness in proportion to visible virtue"(Samuel Johnson).

- Mathematics A statement of equality between two ratios. Four quantities, a, b, c, d, are said to be in proportion if a/b = c/d .