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Finding the Fourth Proportional to 68,471.20, 102,721.20 and 38,864.80

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Solution

The fourth proportional to 68,471.20, 102,721.20 and 38,864.80 is: 58,305.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,471.20 : 102,721.20 = 38,864.80 : x
  2. Step 2: Convert to fraction form
    68,471.20/102,721.20 = 38,864.80/x
  3. Step 3: Cross multiply
    68,471.20x = 102,721.20 × 38,864.80
  4. Step 4: Simplify right side
    68,471.20x = 3,992,238,893.76
  5. Step 5: Solve for x
    x = 3,992,238,893.76/68,471.20
  6. Step 6: Final answer
    x = 58,305.37

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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.