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 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 See also Proportional representation, in electoral systems