Solve a proportion problem: A milkshake is 4 parts milk, 2 parts banana, and one part protein powder. What percent of of the milkshake is banana?

2/7 of the milkshake is banana so about 28 percent is banana

The correct answer is 28.571%

The reason why this is true is because if a milkshake is one whole, or one hundred percent, it means that to find the percentage of banana we have to find how many percents add up to one whole part. To to this we have to see how many parts we have in the given ratio. The 4 parts of milk, 2 parts of banana and one part of protein powder mean that the whole milkshake has 7 parts and the banana makes up for 2/7 of the whole or in percents: (100/7) * 2=14.285*2=28.571%