What is a proportional ratio?
Proportional Ratios

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Mathematics
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A proportional ratio is a relationship between two quantities where the ratio of one quantity to another remains constant. For example, if the ratio of boys to girls in a class is 2:3, it means for every 2 boys, there are 3 girls.
2.
FLASHCARD QUESTION
Front
How do you determine if two ratios are proportional?
Back
Two ratios are proportional if their cross products are equal. For example, for the ratios a:b and c:d, they are proportional if a*d = b*c.
3.
FLASHCARD QUESTION
Front
What is the formula for finding a missing value in a proportional ratio?
Back
The formula is: (a/b) = (c/d), where a and b are the known values, and c is the known value while d is the missing value. You can solve for d by rearranging the formula.
4.
FLASHCARD QUESTION
Front
Give an example of a real-life situation that involves proportional ratios.
Back
A real-life example is cooking. If a recipe requires 2 cups of flour for every 3 cups of sugar, the ratio of flour to sugar is 2:3. If you want to use 4 cups of flour, you would need 6 cups of sugar to maintain the same ratio.
5.
FLASHCARD QUESTION
Front
What is the relationship between proportional ratios and scale factors?
Back
Proportional ratios are used to determine scale factors in similar figures. If two shapes are similar, the ratio of their corresponding sides is constant, which is the scale factor.
6.
FLASHCARD QUESTION
Front
What is a unit rate?
Back
A unit rate is a ratio that compares a quantity to one unit of another quantity. For example, if a car travels 300 miles in 5 hours, the unit rate is 60 miles per hour.
7.
FLASHCARD QUESTION
Front
How can you use proportional ratios to solve problems involving percentages?
Back
You can set up a proportion to find the percentage. For example, if you want to find what percentage 20 is of 80, you can set up the proportion 20/x = 80/100 and solve for x.
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