To solve the problem, we need to start by figuring out how many students rode in buses and how many rode in cars.
- Total number of students: 472
- Number of students who rode in cars: 4
Now, we can find out how many students were on the buses:
\[ 472 - 4 = 468 \text{ students (in buses)} \]
Next, we know that these 468 students filled 9 buses. To find out how many students were in each bus, we divide the total number of students in buses by the number of buses:
\[ \frac{468}{9} = 52 \text{ students per bus} \]
Thus, the answer is:
52 students