Children make up a large proportion of the world's population.
The class consists of men and women in roughly equal proportions.
Still, a great proportion of those surveyed mentioned your friendly staff as your strong point. (Certificate in Advanced English; C1; Russian)
The punishment is completely out of proportion to the crime.
If you were doing it to make a profit, I could understand, but for a library it is just out of proportion [and] I even believe more people could be attracted [if] the prices decrease. (Certificate of Proficiency in English; C2; Dutch)
Your tax payment increases in proportion to your salary.
One aspect of the question is the fact that a sportsman's salary is supposedly not in proportion to the number of hours he work[s]. (Certificate of Proficiency in English; C2; Swedish)