この学科は男女の比率がほぼ半々だ。
In this department the ratio of men to women is roughly half and half.
輸出に占める自動車の比率が年々高まっている。
The proportion of cars in total exports is rising year by year.
セメントと砂を一対三の比率で混ぜてください。
Mix the cement and sand in a ratio of one to three.