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Finding the Fourth Proportional to 8,138.28, 12,207.14 and 3,455.28

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Solution

The fourth proportional to 8,138.28, 12,207.14 and 3,455.28 is: 5,182.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,138.28 : 12,207.14 = 3,455.28 : x
  2. Step 2: Convert to fraction form
    8,138.28/12,207.14 = 3,455.28/x
  3. Step 3: Cross multiply
    8,138.28x = 12,207.14 × 3,455.28
  4. Step 4: Simplify right side
    8,138.28x = 42,179,086.70
  5. Step 5: Solve for x
    x = 42,179,086.70/8,138.28
  6. Step 6: Final answer
    x = 5,182.80

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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.