Final answer:
To find a ratio that is proportional to 1/5, we can set up a proportion by setting the two ratios equal to each other. By cross-multiplying and simplifying, we find that any ratio x/y where y = 5x would be proportional to 1/5.
Step-by-step explanation:
A ratio is said to be proportional when two ratios are found to be equivalent or equal. In this case, we are given the ratio 1/5 and we need to find another ratio that is proportional to it. 
To do this, we can set up a proportion by setting the two ratios equal to each other. 
Let's call the unknown ratio x/y.
So, we have: 1/5 = x/y. 
This is our proportion, and we can solve it by cross-multiplying and then simplifying. Cross-multiplying gives us: 1 * y = 5 * x. 
Simplifying further, we get: y = 5x. 
So, any ratio x/y where y is equal to 5 times x would be proportional to the ratio 1/5.