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Finding the Fourth Proportional to 87,480.60, 131,220.90 and 86,022.60

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Solution

The fourth proportional to 87,480.60, 131,220.90 and 86,022.60 is: 129,033.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,480.60 : 131,220.90 = 86,022.60 : x
  2. Step 2: Convert to fraction form
    87,480.60/131,220.90 = 86,022.60/x
  3. Step 3: Cross multiply
    87,480.60x = 131,220.90 × 86,022.60
  4. Step 4: Simplify right side
    87,480.60x = 11,287,962,992.34
  5. Step 5: Solve for x
    x = 11,287,962,992.34/87,480.60
  6. Step 6: Final answer
    x = 129,033.90

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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.