Find a common unit to compare and by dividing each section of the first rectangle into three parts and each section of the second rectangle into four parts. Both rectangles are now divided into 12 equal parts. Now that the rectangles are divided equally, the shaded parts can be compared. There are 9 out of 12 parts shaded in the top rectangle and 4 out of 12 parts shaded in the bottom rectangle. So, the tape diagrams represent _______. The division equation and solution are shown below.
a) Ratio of shaded areas; 9:4
b) Percentage of shaded areas; 75%:33.3%
c) Fraction of shaded areas; 3/4:1/3
d) Proportion of shaded areas; 9/12:4/12