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Finding the Fourth Proportional to 3,939.89, 5,910.86 and 1,474.89

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Solution

The fourth proportional to 3,939.89, 5,910.86 and 1,474.89 is: 2,212.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.89 : 5,910.86 = 1,474.89 : x
  2. Step 2: Convert to fraction form
    3,939.89/5,910.86 = 1,474.89/x
  3. Step 3: Cross multiply
    3,939.89x = 5,910.86 × 1,474.89
  4. Step 4: Simplify right side
    3,939.89x = 8,717,874.78
  5. Step 5: Solve for x
    x = 8,717,874.78/3,939.89
  6. Step 6: Final answer
    x = 2,212.72

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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.