Final answer:
The area of a square is proportional to the square of its side length.
Step-by-step explanation:
The situation described is proportional. The area of a square is indeed proportional to the square of its side length. In other words, if you double the side length of a square, its area will increase fourfold. Similarly, if you triple the side length, the area will increase ninefold, and so on. Therefore, the ratio of the area of a square to the square of its side length remains constant, making it a proportional relationship.