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Finding the Fourth Proportional to 66,911.20, 100,335.02 and 38,839.86

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Solution

The fourth proportional to 66,911.20, 100,335.02 and 38,839.86 is: 58,241.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,911.20 : 100,335.02 = 38,839.86 : x
  2. Step 2: Convert to fraction form
    66,911.20/100,335.02 = 38,839.86/x
  3. Step 3: Cross multiply
    66,911.20x = 100,335.02 × 38,839.86
  4. Step 4: Simplify right side
    66,911.20x = 3,896,998,306.65
  5. Step 5: Solve for x
    x = 3,896,998,306.65/66,911.20
  6. Step 6: Final answer
    x = 58,241.34

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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.