Proportional
Part of speech: adjective
Definition: At a constant ratio (to). Two magnitudes (numbers) are said to be proportional if the second varies in a direct relation arithmetically to the first. In proportion (to), proportionate. More common in US than UK.
Example sentence: In my view what you can't argue for is a system that is neither decisive nor proportional and can be indecisive and disproportionate at the same time.
Relative
Part of speech: adjective
Definition: Relevant; pertinentConnected to or depending on something else; not absolute; comparative.That relates to an antecedentHaving the same key but differing in being major or minor
Part of speech: noun
Definition: Someone in the same family; someone connected by blood, marriage, or adoption.
Example sentence: Excellence, then, is a state concerned with choice, lying in a mean, relative to us, this being determined by reason and in the way in which the man of practical wisdom would determine it.