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Finding the Fourth Proportional to 81,115.92, 121,692.60 and 34,370.64

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Solution

The fourth proportional to 81,115.92, 121,692.60 and 34,370.64 is: 51,563.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,115.92 : 121,692.60 = 34,370.64 : x
  2. Step 2: Convert to fraction form
    81,115.92/121,692.60 = 34,370.64/x
  3. Step 3: Cross multiply
    81,115.92x = 121,692.60 × 34,370.64
  4. Step 4: Simplify right side
    81,115.92x = 4,182,652,545.26
  5. Step 5: Solve for x
    x = 4,182,652,545.26/81,115.92
  6. Step 6: Final answer
    x = 51,563.89

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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.