Do these ratios form a proportion?

10 teachers for every 95 students

2 teachers for every 19 students

Yes, these ratios form a proportion.

10 teachers : 95 students can be written as 10/95
2 teachers : 19 students can be written as 2/19

By simplifying both fractions, we get:

10/95 = 2/19

This means that the two ratios are equal, forming a proportion.