Finding the Fourth Proportional to 81,129.26, 121,687.80 and 28,539.20
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Solution
The fourth proportional to 81,129.26, 121,687.80 and 28,539.20 is: 42,806.66
Step by Step Solution
- Step 1: Write the proportion equation
81,129.26 : 121,687.80 = 28,539.20 : x - Step 2: Convert to fraction form
81,129.26/121,687.80 = 28,539.20/x - Step 3: Cross multiply
81,129.26x = 121,687.80 × 28,539.20 - Step 4: Simplify right side
81,129.26x = 3,472,872,461.76 - Step 5: Solve for x
x = 3,472,872,461.76/81,129.26 - Step 6: Final answer
x = 42,806.66
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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.