Proration

Think: ration. You're on a raft. There are 5 of you, and only 3 bananas. Nothing else. So you proration (if you're a democratic raft) 3/5 of a banana to each of you. After not being rescued for 3 days, that fat guy who may die tomorrow starts looking delish. So you're trying to figure out how you ration an arm into 4 equal pieces, uniformly, pro rata, prorationally.

Pass the ketchup. Yum.

Do not see: Cannibalization for this one.