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Finding the Fourth Proportional to 68,842.20, 103,129.70 and 40,310.20

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Solution

The fourth proportional to 68,842.20, 103,129.70 and 40,310.20 is: 60,387.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,842.20 : 103,129.70 = 40,310.20 : x
  2. Step 2: Convert to fraction form
    68,842.20/103,129.70 = 40,310.20/x
  3. Step 3: Cross multiply
    68,842.20x = 103,129.70 × 40,310.20
  4. Step 4: Simplify right side
    68,842.20x = 4,157,178,832.94
  5. Step 5: Solve for x
    x = 4,157,178,832.94/68,842.20
  6. Step 6: Final answer
    x = 60,387.07

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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.