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Finding the Fourth Proportional to 3,279.11, 4,917.87 and 939.03

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Solution

The fourth proportional to 3,279.11, 4,917.87 and 939.03 is: 1,408.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,279.11 : 4,917.87 = 939.03 : x
  2. Step 2: Convert to fraction form
    3,279.11/4,917.87 = 939.03/x
  3. Step 3: Cross multiply
    3,279.11x = 4,917.87 × 939.03
  4. Step 4: Simplify right side
    3,279.11x = 4,618,027.47
  5. Step 5: Solve for x
    x = 4,618,027.47/3,279.11
  6. Step 6: Final answer
    x = 1,408.32

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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.