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Finding the Fourth Proportional to 80,687.20, 120,886.80 and 39,042.40

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Solution

The fourth proportional to 80,687.20, 120,886.80 and 39,042.40 is: 58,493.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,687.20 : 120,886.80 = 39,042.40 : x
  2. Step 2: Convert to fraction form
    80,687.20/120,886.80 = 39,042.40/x
  3. Step 3: Cross multiply
    80,687.20x = 120,886.80 × 39,042.40
  4. Step 4: Simplify right side
    80,687.20x = 4,719,710,800.32
  5. Step 5: Solve for x
    x = 4,719,710,800.32/80,687.20
  6. Step 6: Final answer
    x = 58,493.92

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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.