As you know, "ratio" is a relationship between two groups or amounts that expresses how much bigger one is than the other. While "proportion" is the number or amount of a group or part of something when compared to the whole.
I know it may sound quite distinguishable to you native speakers, but it is somehow vague to me as a non-native individual. I wonder if you do me a favor and let me know what structure is used in each sentence below:
- Everyone can spend money ........ his/her income.
a. in proportion to
b. in ratio of
- The .......... of men to women in the conference was 10 to 1.
- The income you earn in this job is in direct ........... to the effort you put in.
- His feet are small in .......... to his weight.