Use 'commensurate' to discuss fairness in terms of input and output, like effort and reward. They sought a division of profits commensurate with their investments.
Pro Tip 2/3
Balance
'Commensurate' implies a sensible balance between items being compared. The punishment should be commensurate with the crime.
Pro Tip 3/3
Professional Context
'Commensurate' is often used in professional settings to talk about salaries and responsibilities. Job benefits will be commensurate with the level of the position.