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Finding the Fourth Proportional to 20,399.80, 30,541.30 and 12,555.80

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Solution

The fourth proportional to 20,399.80, 30,541.30 and 12,555.80 is: 18,797.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,399.80 : 30,541.30 = 12,555.80 : x
  2. Step 2: Convert to fraction form
    20,399.80/30,541.30 = 12,555.80/x
  3. Step 3: Cross multiply
    20,399.80x = 30,541.30 × 12,555.80
  4. Step 4: Simplify right side
    20,399.80x = 383,470,454.54
  5. Step 5: Solve for x
    x = 383,470,454.54/20,399.80
  6. Step 6: Final answer
    x = 18,797.76

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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.