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Finding the Fourth Proportional to 3,247.56, 4,872.12 and 939

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Solution

The fourth proportional to 3,247.56, 4,872.12 and 939 is: 1,408.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,247.56 : 4,872.12 = 939 : x
  2. Step 2: Convert to fraction form
    3,247.56/4,872.12 = 939/x
  3. Step 3: Cross multiply
    3,247.56x = 4,872.12 × 939
  4. Step 4: Simplify right side
    3,247.56x = 4,574,920.68
  5. Step 5: Solve for x
    x = 4,574,920.68/3,247.56
  6. Step 6: Final answer
    x = 1,408.73

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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.