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Finding the Third Proportional to 3,408 and 8,211

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Solution

The third proportional to 3,408 and 8,211 is: 19,783.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,408 : 8,211 = 8,211 : x
  2. Step 2: Convert to fraction form
    3,408/8,211 = 8,211/x
  3. Step 3: Cross multiply
    3,408x = 8,211 × 8,211
  4. Step 4: Simplify right side
    3,408x = 67,420,521
  5. Step 5: Solve for x
    x = 67,420,521/3,408
  6. Step 6: Final answer
    x = 19,783.02

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Why These Related Problems?

These problems maintain the same ratio (2.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.