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Finding the Fourth Proportional to 68,470.70, 102,720.45 and 38,864.30

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Solution

The fourth proportional to 68,470.70, 102,720.45 and 38,864.30 is: 58,304.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,470.70 : 102,720.45 = 38,864.30 : x
  2. Step 2: Convert to fraction form
    68,470.70/102,720.45 = 38,864.30/x
  3. Step 3: Cross multiply
    68,470.70x = 102,720.45 × 38,864.30
  4. Step 4: Simplify right side
    68,470.70x = 3,992,158,384.94
  5. Step 5: Solve for x
    x = 3,992,158,384.94/68,470.70
  6. Step 6: Final answer
    x = 58,304.62

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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.