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Finding the Fourth Proportional to 2,147.88, 3,221.10 and 849

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Solution

The fourth proportional to 2,147.88, 3,221.10 and 849 is: 1,273.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147.88 : 3,221.10 = 849 : x
  2. Step 2: Convert to fraction form
    2,147.88/3,221.10 = 849/x
  3. Step 3: Cross multiply
    2,147.88x = 3,221.10 × 849
  4. Step 4: Simplify right side
    2,147.88x = 2,734,713.90
  5. Step 5: Solve for x
    x = 2,734,713.90/2,147.88
  6. Step 6: Final answer
    x = 1,273.22

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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.