Answer:
Yes, there is a proportional relation.
Step-by-step explanation:
Given,
Ounces of flour for 8 ounces of milk = 15,
So, the ounces for 1 ounces of milk = 
Let y be the ounces of flour for x ounces of milk,
∵ The ounces for x ounces of milk = 

Which is the required relation,
Since,
( True )
I.e. line
passes through the origin,
Hence, the relationship (1) is proportional.