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Finding the Fourth Proportional to 68,321.70, 102,449.73 and 38,731.59

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Solution

The fourth proportional to 68,321.70, 102,449.73 and 38,731.59 is: 58,078.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,321.70 : 102,449.73 = 38,731.59 : x
  2. Step 2: Convert to fraction form
    68,321.70/102,449.73 = 38,731.59/x
  3. Step 3: Cross multiply
    68,321.70x = 102,449.73 × 38,731.59
  4. Step 4: Simplify right side
    68,321.70x = 3,968,040,937.97
  5. Step 5: Solve for x
    x = 3,968,040,937.97/68,321.70
  6. Step 6: Final answer
    x = 58,078.78

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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.