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Finding the Fourth Proportional to 80,672.40, 120,862.80 and 71,341.20

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Solution

The fourth proportional to 80,672.40, 120,862.80 and 71,341.20 is: 106,882.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,672.40 : 120,862.80 = 71,341.20 : x
  2. Step 2: Convert to fraction form
    80,672.40/120,862.80 = 71,341.20/x
  3. Step 3: Cross multiply
    80,672.40x = 120,862.80 × 71,341.20
  4. Step 4: Simplify right side
    80,672.40x = 8,622,497,187.36
  5. Step 5: Solve for x
    x = 8,622,497,187.36/80,672.40
  6. Step 6: Final answer
    x = 106,882.86

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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.