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Finding the Fourth Proportional to 70,781.76, 106,156.56 and 20,865.24

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Solution

The fourth proportional to 70,781.76, 106,156.56 and 20,865.24 is: 31,293.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,781.76 : 106,156.56 = 20,865.24 : x
  2. Step 2: Convert to fraction form
    70,781.76/106,156.56 = 20,865.24/x
  3. Step 3: Cross multiply
    70,781.76x = 106,156.56 × 20,865.24
  4. Step 4: Simplify right side
    70,781.76x = 2,214,982,101.97
  5. Step 5: Solve for x
    x = 2,214,982,101.97/70,781.76
  6. Step 6: Final answer
    x = 31,293.12

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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.