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Finding the Fourth Proportional to 3,147.52, 4,721.30 and 839

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Solution

The fourth proportional to 3,147.52, 4,721.30 and 839 is: 1,258.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,147.52 : 4,721.30 = 839 : x
  2. Step 2: Convert to fraction form
    3,147.52/4,721.30 = 839/x
  3. Step 3: Cross multiply
    3,147.52x = 4,721.30 × 839
  4. Step 4: Simplify right side
    3,147.52x = 3,961,170.70
  5. Step 5: Solve for x
    x = 3,961,170.70/3,147.52
  6. Step 6: Final answer
    x = 1,258.51

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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.