Finding the Fourth Proportional to 81,414.20, 122,121.30 and 74,415.80
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Solution
The fourth proportional to 81,414.20, 122,121.30 and 74,415.80 is: 111,623.70
Step by Step Solution
- Step 1: Write the proportion equation
81,414.20 : 122,121.30 = 74,415.80 : x - Step 2: Convert to fraction form
81,414.20/122,121.30 = 74,415.80/x - Step 3: Cross multiply
81,414.20x = 122,121.30 × 74,415.80 - Step 4: Simplify right side
81,414.20x = 9,087,754,236.54 - Step 5: Solve for x
x = 9,087,754,236.54/81,414.20 - Step 6: Final answer
x = 111,623.70
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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.