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Finding the Fourth Proportional to 20,520.28, 30,780.28 and 5,729.20

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Solution

The fourth proportional to 20,520.28, 30,780.28 and 5,729.20 is: 8,593.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,520.28 : 30,780.28 = 5,729.20 : x
  2. Step 2: Convert to fraction form
    20,520.28/30,780.28 = 5,729.20/x
  3. Step 3: Cross multiply
    20,520.28x = 30,780.28 × 5,729.20
  4. Step 4: Simplify right side
    20,520.28x = 176,346,380.18
  5. Step 5: Solve for x
    x = 176,346,380.18/20,520.28
  6. Step 6: Final answer
    x = 8,593.76

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1.5x scale

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.