Proportionality may refer to: Proportionality (mathematics), the relationship between two variables whose ratio is constant Proportionality (law), A legal principle under municipal law in which the punishment of a certain crime should be in proportion to the severity of the crime itself, and under international law an important consideration when assessing the military necessity of an attack on a military objective. The ratio of one quantity to another, especially of a part compared to a whole (see also fraction). In another mathematical context, a proportion is the statement of equality between two ratios. Proportion (architecture) describes the relationships between elements of a design Body proportions, in art, are the study of relation of human body parts to each other and the whole Proportions, or geometric aspect ratio In mathematics, a ratio is a relationship between two numbers indicating how many times the first number contains the second.For example, if a bowl of fruit contains eight oranges and six lemons, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3). Similarly, the ratio of lemons to oranges is 6:8 (or 3:4) and the ratio of oranges to the total amount of fruit is 8:14 (or 4:7). The numbers in a ratio may be quantities of any kind, such as counts of persons or objects, or such as measurements of lengths, weights, time, etc.