Finding the Fourth Proportional to 87.19, 130.77 and 74.98
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Solution
The fourth proportional to 87.19, 130.77 and 74.98 is: 112.46
Step by Step Solution
- Step 1: Write the proportion equation
87.19 : 130.77 = 74.98 : x - Step 2: Convert to fraction form
87.19/130.77 = 74.98/x - Step 3: Cross multiply
87.19x = 130.77 × 74.98 - Step 4: Simplify right side
87.19x = 9,805.13 - Step 5: Solve for x
x = 9,805.13/87.19 - Step 6: Final answer
x = 112.46
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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.