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Finding the Third Proportional to 3,309 and 3,917

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Solution

The third proportional to 3,309 and 3,917 is: 4,636.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,309 : 3,917 = 3,917 : x
  2. Step 2: Convert to fraction form
    3,309/3,917 = 3,917/x
  3. Step 3: Cross multiply
    3,309x = 3,917 × 3,917
  4. Step 4: Simplify right side
    3,309x = 15,342,889
  5. Step 5: Solve for x
    x = 15,342,889/3,309
  6. Step 6: Final answer
    x = 4,636.71

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.