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Finding the Fourth Proportional to 67,078.82, 100,486.76 and 38,939.87

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Solution

The fourth proportional to 67,078.82, 100,486.76 and 38,939.87 is: 58,333.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,078.82 : 100,486.76 = 38,939.87 : x
  2. Step 2: Convert to fraction form
    67,078.82/100,486.76 = 38,939.87/x
  3. Step 3: Cross multiply
    67,078.82x = 100,486.76 × 38,939.87
  4. Step 4: Simplify right side
    67,078.82x = 3,912,941,371.12
  5. Step 5: Solve for x
    x = 3,912,941,371.12/67,078.82
  6. Step 6: Final answer
    x = 58,333.49

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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.