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Finding the Fourth Proportional to 68,920.80, 103,381.20 and 29,481.90

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Solution

The fourth proportional to 68,920.80, 103,381.20 and 29,481.90 is: 44,222.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,920.80 : 103,381.20 = 29,481.90 : x
  2. Step 2: Convert to fraction form
    68,920.80/103,381.20 = 29,481.90/x
  3. Step 3: Cross multiply
    68,920.80x = 103,381.20 × 29,481.90
  4. Step 4: Simplify right side
    68,920.80x = 3,047,874,200.28
  5. Step 5: Solve for x
    x = 3,047,874,200.28/68,920.80
  6. Step 6: Final answer
    x = 44,222.85

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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.