proportional

nouns

one of the quantities in a mathematical proportion
is a part of
the quotient obtained when the magnitude of a part is divided by the magnitude of the whole
is a type of (narrower)
the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable

adjectives

properly related in size or degree or other measurable characteristics; usually followed by `to'
"the punishment ought to be proportional to the crime"; "earnings relative to production"
having a constant ratio
is derived from
is similar to
being in due proportion
"proportionate representation of a minority group"