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Finding the Third Proportional to 311 and 349

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Solution

The third proportional to 311 and 349 is: 391.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    311 : 349 = 349 : x
  2. Step 2: Convert to fraction form
    311/349 = 349/x
  3. Step 3: Cross multiply
    311x = 349 × 349
  4. Step 4: Simplify right side
    311x = 121,801
  5. Step 5: Solve for x
    x = 121,801/311
  6. Step 6: Final answer
    x = 391.64

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Why These Related Problems?

These problems maintain the same ratio (1.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.