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Finding the Fourth Proportional to 87,819.39, 131,729.41 and 21,259.41

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Solution

The fourth proportional to 87,819.39, 131,729.41 and 21,259.41 is: 31,889.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,819.39 : 131,729.41 = 21,259.41 : x
  2. Step 2: Convert to fraction form
    87,819.39/131,729.41 = 21,259.41/x
  3. Step 3: Cross multiply
    87,819.39x = 131,729.41 × 21,259.41
  4. Step 4: Simplify right side
    87,819.39x = 2,800,488,930.75
  5. Step 5: Solve for x
    x = 2,800,488,930.75/87,819.39
  6. Step 6: Final answer
    x = 31,889.19

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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.