Ratio and Proportion Applications

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When setting up proportions, be sure to be consistent.  Units for the numerators should be the same and units for the denominators should be the same as well.

Proportion Problem: If 2 out of 3 dentists prefer Crest toothpaste, how many prefer Crest out of 600 dentists surveyed?
Proportion Problem: In Visalia 3 out of every 7 voters said yes to proposition 40.  If 42,000 people voted, how many said no to proposition 40?

Proportion Problem: A recipe calls for 5 tablespoons of sugar for every 8 cups of flour.  How many tablespoons of sugar are required for 32 cups of flour?
 
Coin Problem: Sally has 12 coins consisting of quarters and dimes.  The value adds to $2.25.  How many of each coin does she have?
Mixture Problem: A 50% alcohol solution is mixed with a 10% alcohol solution to create 8 ounces of a 32% alcohol solution.  How much of each is needed?
Interest Problem: Mary invested her total savings of $3,400 in two accounts.  Her mutual fund account earned 8% interest last year and her CD earned 5%.  If her total interest for the year was $245, how much was in each account?
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