To set up a proportion based on the information provided about Mr. Martin's class and the entire school, we can use the ratio of boys in the class compared to the total number of students in the class, and set that equal to the ratio of boys in the school to the total number of students in the school.
Given:
- In Mr. Martin's class: 18 boys out of 32 students
- In the school: 468 boys (let's call the total number of students in the school s)
We can set up the proportion as follows:
\[ \frac{18}{32} = \frac{468}{s} \]
This means that the correct option to use to find the total number of students in the school is:
18 over 32 is equal to s over 468.
Thus, the answer is:
18 over 32 is equal to s over 468.