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Finding the Fourth Proportional to 81,091.80, 121,572.90 and 34,306.20

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Solution

The fourth proportional to 81,091.80, 121,572.90 and 34,306.20 is: 51,431.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,091.80 : 121,572.90 = 34,306.20 : x
  2. Step 2: Convert to fraction form
    81,091.80/121,572.90 = 34,306.20/x
  3. Step 3: Cross multiply
    81,091.80x = 121,572.90 × 34,306.20
  4. Step 4: Simplify right side
    81,091.80x = 4,170,704,221.98
  5. Step 5: Solve for x
    x = 4,170,704,221.98/81,091.80
  6. Step 6: Final answer
    x = 51,431.89

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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.