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Finding the Fourth Proportional to 20,487.76, 30,732 and 8,801.20

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Solution

The fourth proportional to 20,487.76, 30,732 and 8,801.20 is: 13,201.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.76 : 30,732 = 8,801.20 : x
  2. Step 2: Convert to fraction form
    20,487.76/30,732 = 8,801.20/x
  3. Step 3: Cross multiply
    20,487.76x = 30,732 × 8,801.20
  4. Step 4: Simplify right side
    20,487.76x = 270,478,478.40
  5. Step 5: Solve for x
    x = 270,478,478.40/20,487.76
  6. Step 6: Final answer
    x = 13,201.95

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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.