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Finding the Fourth Proportional to 13,414.60, 18,500 and 8,379.28

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Solution

The fourth proportional to 13,414.60, 18,500 and 8,379.28 is: 11,555.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,414.60 : 18,500 = 8,379.28 : x
  2. Step 2: Convert to fraction form
    13,414.60/18,500 = 8,379.28/x
  3. Step 3: Cross multiply
    13,414.60x = 18,500 × 8,379.28
  4. Step 4: Simplify right side
    13,414.60x = 155,016,680
  5. Step 5: Solve for x
    x = 155,016,680/13,414.60
  6. Step 6: Final answer
    x = 11,555.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.