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Finding the Third Proportional to 1,287 and 3,474

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Solution

The third proportional to 1,287 and 3,474 is: 9,377.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287 : 3,474 = 3,474 : x
  2. Step 2: Convert to fraction form
    1,287/3,474 = 3,474/x
  3. Step 3: Cross multiply
    1,287x = 3,474 × 3,474
  4. Step 4: Simplify right side
    1,287x = 12,068,676
  5. Step 5: Solve for x
    x = 12,068,676/1,287
  6. Step 6: Final answer
    x = 9,377.37

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Why These Related Problems?

These problems maintain the same ratio (2.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.