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Finding the Fourth Proportional to 18,978.87, 26,201.77 and 12,614.09

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Solution

The fourth proportional to 18,978.87, 26,201.77 and 12,614.09 is: 17,414.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.87 : 26,201.77 = 12,614.09 : x
  2. Step 2: Convert to fraction form
    18,978.87/26,201.77 = 12,614.09/x
  3. Step 3: Cross multiply
    18,978.87x = 26,201.77 × 12,614.09
  4. Step 4: Simplify right side
    18,978.87x = 330,511,469.78
  5. Step 5: Solve for x
    x = 330,511,469.78/18,978.87
  6. Step 6: Final answer
    x = 17,414.71

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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.