Answer:
Yes, ratios of blue paint to yellow paint form a proportional relationship
Explanation:
In case of the first person:
Number of blue parts = 2
Number of yellow parts

In case of another person:
Number of blue parts

Number of yellow parts

Ratio of blue parts

Ratio of yellow parts

As ration of blue parts is equal to the ratio of yellow parts, ratios of blue paint to yellow paint form a proportional relationship