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Finding the Fourth Proportional to 20,622.80, 30,913.25 and 8,137.87

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Solution

The fourth proportional to 20,622.80, 30,913.25 and 8,137.87 is: 12,198.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,622.80 : 30,913.25 = 8,137.87 : x
  2. Step 2: Convert to fraction form
    20,622.80/30,913.25 = 8,137.87/x
  3. Step 3: Cross multiply
    20,622.80x = 30,913.25 × 8,137.87
  4. Step 4: Simplify right side
    20,622.80x = 251,567,891.81
  5. Step 5: Solve for x
    x = 251,567,891.81/20,622.80
  6. Step 6: Final answer
    x = 12,198.53

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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.