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Finding the Fourth Proportional to 68,781.20, 103,042.20 and 35,387.60

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Solution

The fourth proportional to 68,781.20, 103,042.20 and 35,387.60 is: 53,014.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,781.20 : 103,042.20 = 35,387.60 : x
  2. Step 2: Convert to fraction form
    68,781.20/103,042.20 = 35,387.60/x
  3. Step 3: Cross multiply
    68,781.20x = 103,042.20 × 35,387.60
  4. Step 4: Simplify right side
    68,781.20x = 3,646,416,156.72
  5. Step 5: Solve for x
    x = 3,646,416,156.72/68,781.20
  6. Step 6: Final answer
    x = 53,014.72

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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.