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Finding the Fourth Proportional to 87,999.60, 131,707.80 and 81,001.20

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Solution

The fourth proportional to 87,999.60, 131,707.80 and 81,001.20 is: 121,233.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,999.60 : 131,707.80 = 81,001.20 : x
  2. Step 2: Convert to fraction form
    87,999.60/131,707.80 = 81,001.20/x
  3. Step 3: Cross multiply
    87,999.60x = 131,707.80 × 81,001.20
  4. Step 4: Simplify right side
    87,999.60x = 10,668,489,849.36
  5. Step 5: Solve for x
    x = 10,668,489,849.36/87,999.60
  6. Step 6: Final answer
    x = 121,233.39

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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.