Final answer:
The equation that represents the proportional relationship between Sprite and fruit punch in the recipe for sparkling punch is s/3 = f/2.
Step-by-step explanation:
We can write the equation to represent the proportional relationship between the amount of Sprite, s, and the amount of fruit punch, f, in the recipe for sparkling punch as follows:
s/3 = f/2
This equation states that the ratio of Sprite to fruit punch is equal to the ratio of their respective amounts, with 3 cups of Sprite for every 2 cups of fruit punch.