Calculate Monday Purple balloons

From the Monday ratio $P:G = 3:4$ and $P:\text{Grey} = 3:2$, the combined ratio is $P:G:\text{Grey} = 3:4:2$. The total units are $3+4+2 = 9$. Given total $= 450$, one unit is $450/9 = 50$. Thus, $P = 3 \times 50 = 150$.

$P_{\text{Monday}} = 3 \times 50 = 150$

Calculate Wednesday Green balloons

Given $P_{\text{Wednesday}} = 150$ and the condition $P = \frac{5}{11}G$, we solve for $G$. Substituting $P = 150$, we get $150 = \frac{5}{11}G$.

$G_{\text{Wednesday}} = \frac{150 \times 11}{5} = 30 \times 11 = 330$

Calculate the final ratio

We find the ratio of $G_{\text{Wednesday}}$ to $P_{\text{Monday}}$. The values are $330$ and $150$ respectively.

$\frac{330}{150} = \frac{33}{15} = \frac{11}{5}$