We will have the following:
From the graph we can see that they are in "balance" and thus each side of the balance for each pair will be equal to 1/2, thus:
Triangle = 1/2:
2Square = 1/2 => Square = 1/4.
Same for the other side:
3Flowers = 1/2 => Flower = 1/6
4Pentagons = 1/2 => Pentagon = 1/8.
That is: