Word Problems Involving Equivalent Ratio
An equivalent ratio is a ratio that has the same relationship between numbers as another ratio, but the numbers themselves may be different.
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For example, the ratio 2:4 is equivalent to the ratio 4:8 because in both cases, the relationship between the numbers is the same (1:2).
Step-by-step guide to solving equivalent ratios word problems
To solve the equivalent ratio’s word problems, follow these steps:
Step 1: Find the ratio given in the word problem.
Step 2: Find the given value of one of the two values involved in the ratio
Step 3: Divide the given value of step 2 by the corresponding value in the ratio from step 1.
Step 4: Multiply both numbers in the original ratio by the number found in step 3 to construct the equivalent ratio.
Word Problems Involving Equivalent Ratio – Examples 1
If a box contains pink and green marbles in the ratio of 3:8 pink to green, how many pink marbles are there if 40 green marbles are in the box?
Solution:
Step 1: Write the ratios. \(\frac{3}{8}=\frac{x}{40}\)
Step 2: Use cross multiplication. \(3×40=8×x⇒120=8x\)
Step 3: Divide. \(x=\frac{120}{8}=15\)
Word Problems Involving Equivalent Ratio – Examples 2
Are these ratios equivalent? 10 books for 15 shelves, and 20 books for 25 shelves.
Solution:
Step 1: Write the ratios. \(\frac{10}{15}, \frac{20}{25}\)
Step 2: Use cross multiplication. \(10×25=20×15⇒250≠300\)
So these ratios are not equivalent.
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