Finding the Fourth Proportional to 87.40, 130.76 and 84.97
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Solution
The fourth proportional to 87.40, 130.76 and 84.97 is: 127.12
Step by Step Solution
- Step 1: Write the proportion equation
87.40 : 130.76 = 84.97 : x - Step 2: Convert to fraction form
87.40/130.76 = 84.97/x - Step 3: Cross multiply
87.40x = 130.76 × 84.97 - Step 4: Simplify right side
87.40x = 11,110.68 - Step 5: Solve for x
x = 11,110.68/87.40 - Step 6: Final answer
x = 127.12
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.