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Finding the Fourth Proportional to 68,859.92, 103,272.87 and 18,937.60

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Solution

The fourth proportional to 68,859.92, 103,272.87 and 18,937.60 is: 28,401.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,859.92 : 103,272.87 = 18,937.60 : x
  2. Step 2: Convert to fraction form
    68,859.92/103,272.87 = 18,937.60/x
  3. Step 3: Cross multiply
    68,859.92x = 103,272.87 × 18,937.60
  4. Step 4: Simplify right side
    68,859.92x = 1,955,740,115.75
  5. Step 5: Solve for x
    x = 1,955,740,115.75/68,859.92
  6. Step 6: Final answer
    x = 28,401.72

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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.