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Finding the Third Proportional to 3,315 and 3,691

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Solution

The third proportional to 3,315 and 3,691 is: 4,109.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,315 : 3,691 = 3,691 : x
  2. Step 2: Convert to fraction form
    3,315/3,691 = 3,691/x
  3. Step 3: Cross multiply
    3,315x = 3,691 × 3,691
  4. Step 4: Simplify right side
    3,315x = 13,623,481
  5. Step 5: Solve for x
    x = 13,623,481/3,315
  6. Step 6: Final answer
    x = 4,109.65

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.