Finding the Fourth Proportional to 87.17, 130.15 and 71.99
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Solution
The fourth proportional to 87.17, 130.15 and 71.99 is: 107.47
Step by Step Solution
- Step 1: Write the proportion equation
87.17 : 130.15 = 71.99 : x - Step 2: Convert to fraction form
87.17/130.15 = 71.99/x - Step 3: Cross multiply
87.17x = 130.15 × 71.99 - Step 4: Simplify right side
87.17x = 9,368.49 - Step 5: Solve for x
x = 9,368.49/87.17 - Step 6: Final answer
x = 107.47
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.