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Finding the Fourth Proportional to 68,115.90, 102,234.60 and 40,000.80

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Solution

The fourth proportional to 68,115.90, 102,234.60 and 40,000.80 is: 60,036.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,115.90 : 102,234.60 = 40,000.80 : x
  2. Step 2: Convert to fraction form
    68,115.90/102,234.60 = 40,000.80/x
  3. Step 3: Cross multiply
    68,115.90x = 102,234.60 × 40,000.80
  4. Step 4: Simplify right side
    68,115.90x = 4,089,465,787.68
  5. Step 5: Solve for x
    x = 4,089,465,787.68/68,115.90
  6. Step 6: Final answer
    x = 60,036.88

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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.