Proportionality

Proportionality, proportion or proportional may refer to:

Mathematics

 * Proportionality (mathematics), the property of two variables being in a multiplicative relation to a constant
 * Ratio, of one quantity to another, especially of a part compared to a whole
 * Fraction (mathematics)
 * Aspect ratio or proportions
 * Proportional division, a kind of fair division
 * Percentage, a number or ratio expressed as a fraction of 100

Science and art

 * Proportional fonts
 * Proportionally fair, a scheduling algorithm
 * Proportional control, a type of linear feedback control system

Other uses

 * Proportionality (law), a legal principle
 * Proportionality (International Humanitarian Law), a law of war
 * Proportion (architecture), describes the relationships between elements of a design
 * Body proportions, in art, the study of relation of human body parts to each other and the whole