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Finding the Fourth Proportional to 81,496.60, 122,244.90 and 71,128.60

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Solution

The fourth proportional to 81,496.60, 122,244.90 and 71,128.60 is: 106,692.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,496.60 : 122,244.90 = 71,128.60 : x
  2. Step 2: Convert to fraction form
    81,496.60/122,244.90 = 71,128.60/x
  3. Step 3: Cross multiply
    81,496.60x = 122,244.90 × 71,128.60
  4. Step 4: Simplify right side
    81,496.60x = 8,695,108,594.14
  5. Step 5: Solve for x
    x = 8,695,108,594.14/81,496.60
  6. Step 6: Final answer
    x = 106,692.90

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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.