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Finding the Fourth Proportional to 6,979.86, 10,469.88 and 3,859.38

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Solution

The fourth proportional to 6,979.86, 10,469.88 and 3,859.38 is: 5,789.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,979.86 : 10,469.88 = 3,859.38 : x
  2. Step 2: Convert to fraction form
    6,979.86/10,469.88 = 3,859.38/x
  3. Step 3: Cross multiply
    6,979.86x = 10,469.88 × 3,859.38
  4. Step 4: Simplify right side
    6,979.86x = 40,407,245.47
  5. Step 5: Solve for x
    x = 40,407,245.47/6,979.86
  6. Step 6: Final answer
    x = 5,789.12

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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.