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Finding the Fourth Proportional to 67,438.56, 101,159.70 and 20,691.44

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Solution

The fourth proportional to 67,438.56, 101,159.70 and 20,691.44 is: 31,037.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,438.56 : 101,159.70 = 20,691.44 : x
  2. Step 2: Convert to fraction form
    67,438.56/101,159.70 = 20,691.44/x
  3. Step 3: Cross multiply
    67,438.56x = 101,159.70 × 20,691.44
  4. Step 4: Simplify right side
    67,438.56x = 2,093,139,862.97
  5. Step 5: Solve for x
    x = 2,093,139,862.97/67,438.56
  6. Step 6: Final answer
    x = 31,037.73

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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.