Final answer:
Using the given ratio, we multiplied the number of students who went on the trip (252) by the inverse of the fraction (4/3) to find the total number of eighth graders, which is 336.
Step-by-step explanation:
To calculate the total number of eighth graders, we need to use the given information: 3/4 of the eighth graders at Kingston Middle School went on the class trip. Given that 252 students went on the trip, to find out how many eighth graders there are in total, we can set up the following equation:
Total number of students = Number of students who went on the trip × Total number of parts (4/3).
Therefore,
Total number of students = 252 × (4/3) = 336.
So, the total number of eighth graders at the school is 336.