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Finding the Fourth Proportional to 20,139.20, 30,201.62 and 7,655.90

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Solution

The fourth proportional to 20,139.20, 30,201.62 and 7,655.90 is: 11,481.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.20 : 30,201.62 = 7,655.90 : x
  2. Step 2: Convert to fraction form
    20,139.20/30,201.62 = 7,655.90/x
  3. Step 3: Cross multiply
    20,139.20x = 30,201.62 × 7,655.90
  4. Step 4: Simplify right side
    20,139.20x = 231,220,582.56
  5. Step 5: Solve for x
    x = 231,220,582.56/20,139.20
  6. Step 6: Final answer
    x = 11,481.12

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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.