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Finding the Fourth Proportional to 16,979.31, 25,469.78 and 9,078.57

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Solution

The fourth proportional to 16,979.31, 25,469.78 and 9,078.57 is: 13,618.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,979.31 : 25,469.78 = 9,078.57 : x
  2. Step 2: Convert to fraction form
    16,979.31/25,469.78 = 9,078.57/x
  3. Step 3: Cross multiply
    16,979.31x = 25,469.78 × 9,078.57
  4. Step 4: Simplify right side
    16,979.31x = 231,229,135.22
  5. Step 5: Solve for x
    x = 231,229,135.22/16,979.31
  6. Step 6: Final answer
    x = 13,618.29

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1.5x scale

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.