比率
ひりつ · hiritsu · JLPT N1 · noun
ratio
比 — two 匕 (person) side by side
比 is a pictograph showing two people standing side by side, facing the same direction. From this image of paired figures came the core meaning 'to compare' or 'to be next to,' since comparing things naturally involves placing them alongside each other.
率 — twisted silk threads with droplets, plus 十
率 originally pictured a net or twisted bundle of silk cords with water droplets shaking off, suggesting something being led or pulled along. From 'leading a rope' it extended to 'lead, command' (shuài) and to 'rate, ratio' (lǜ), as in a fixed proportion. The two readings share this core image of a guiding measure.