Solution: We are given:
To make 6 cups of lemonade, Ronald needs q cup of lemon juice.
Now Ronald has to make 24 cups of lemonade.
Let x be the number of cups of lemon juice needed to make 24 cups of lemonade.
Using the proportionality principle, we have:



Therefore, to make 24 cups of lemonade, he needs
amount of lemon juice.