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Finding the Third Proportional to 2,781 and 4,311

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Solution

The third proportional to 2,781 and 4,311 is: 6,682.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,781 : 4,311 = 4,311 : x
  2. Step 2: Convert to fraction form
    2,781/4,311 = 4,311/x
  3. Step 3: Cross multiply
    2,781x = 4,311 × 4,311
  4. Step 4: Simplify right side
    2,781x = 18,584,721
  5. Step 5: Solve for x
    x = 18,584,721/2,781
  6. Step 6: Final answer
    x = 6,682.75

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.