A popular fruit juice mixture contains 2 cups of grape juice for every 3 cups of apple juice. Three students made fruit juice mixtures of their own.
The following shows the different fruit juice mixtures that the students made.
Tom has 1 cup of grape juice and 2 cups of apple juice.
Sue has 3 cups of grape juice and 4 cups of apple juice.
Mary has 4 cups of grape juice and 6 cups of apple juice.
Which student made a fruit juice mixtures that was proportional to the popular fruit juice mixture?