Where does “比を求める” come from?

比を求める (Japanese) comes from Japanese を, from Proto-Japonic wo — accusative marker; away from, off.

Ancestry of “比を求める”, step by step

比を求める traces back through two separate lines of ancestry.

via Japanese

StepLanguageWordMeaning
1JapaneseA case particle; A conjunctive particle, usually...
2Proto-Japonicwoaccusative marker; away from, off

via Japanese

StepLanguageWordMeaning
1Japanesethe Philippines; ratio; compare to
Every word from Proto-Japonic woEvery word from Japanese