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Finding the Fourth Proportional to 68,757.17, 103,135.85 and 18,837.70

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Solution

The fourth proportional to 68,757.17, 103,135.85 and 18,837.70 is: 28,256.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,757.17 : 103,135.85 = 18,837.70 : x
  2. Step 2: Convert to fraction form
    68,757.17/103,135.85 = 18,837.70/x
  3. Step 3: Cross multiply
    68,757.17x = 103,135.85 × 18,837.70
  4. Step 4: Simplify right side
    68,757.17x = 1,942,842,201.55
  5. Step 5: Solve for x
    x = 1,942,842,201.55/68,757.17
  6. Step 6: Final answer
    x = 28,256.58

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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.