Finding the Fourth Proportional to 86.13, 129.02 and 82.78
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Solution
The fourth proportional to 86.13, 129.02 and 82.78 is: 123.99
Step by Step Solution
- Step 1: Write the proportion equation
86.13 : 129.02 = 82.78 : x - Step 2: Convert to fraction form
86.13/129.02 = 82.78/x - Step 3: Cross multiply
86.13x = 129.02 × 82.78 - Step 4: Simplify right side
86.13x = 10,679.54 - Step 5: Solve for x
x = 10,679.54/86.13 - Step 6: Final answer
x = 123.99
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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.