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Finding the Fourth Proportional to 87,721.60, 131,409.60 and 81,500.80

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Solution

The fourth proportional to 87,721.60, 131,409.60 and 81,500.80 is: 122,090.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,721.60 : 131,409.60 = 81,500.80 : x
  2. Step 2: Convert to fraction form
    87,721.60/131,409.60 = 81,500.80/x
  3. Step 3: Cross multiply
    87,721.60x = 131,409.60 × 81,500.80
  4. Step 4: Simplify right side
    87,721.60x = 10,709,987,527.68
  5. Step 5: Solve for x
    x = 10,709,987,527.68/87,721.60
  6. Step 6: Final answer
    x = 122,090.65

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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.