One group of children has 15 red blocks and 45 green blcoks. Another group of children has 30 red blocks and 90 green blocks. Which proportion correctly describes the relative amount of each color?

1/3
15/45
15/45 = 90/30
15/45 = 30/90

The correct proportion that describes the relative amount of each color is 15/45 = 30/90.