In art, body proportions are the study of relation of human body parts to each other and the whole, essential for depiction of human figure.
In typography, a proportional font is a font whose glyphs are displayed using varying widths.
In the Just war theory, proportionality is one of the conditions.
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The circumference of a circle is proportional to its diameter, with the constant of proportionality equal to π.
On a map drawn to scale, the distance between any two points on the map is proportional to the distance between the two locations the points represent, with the constant of proportionality being the scale of the map.
The amount of force acting on a certain object from the gravity of the Earth at sea level is proportional to the object's mass, with the gravitational constant being the constant of proportionality.