Hello!
The ratio is 2:1.
For this explanation, I will be referring to "distribution of protein in muscles" as just muscles, and "distribution to protein in bones" as just bones.
First, look at what fraction the muscles make up, and what fraction the bones make up. Muscles make up 1/3, bones make up 1/6.
Now, you are looking for the ratio of muscles to bones. You can set this ratio by setting the fractions up into a ratio.
Muscles : bones
1/3 : 1/6
Now, to make these whole numbers, multiply both sides by 6.
1/3 * 6 : 1/6 * 6
6/3 : 6/6
2 : 1
Hope this helps!