Usage Note
Proporcional is invariable for gender (un castigo proporcional, una respuesta proporcional) and typically appears in legal, mathematical, and political discourse. The phrase representación proporcional (proportional representation) is a common set phrase in electoral contexts. The adverb is proporcionalmente.
Examples
"La pena debe ser proporcional al delito."
Natural Translation
The sentence must be proportional to the crime.

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