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Finding the Third Proportional to 3,278 and 4,209

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Solution

The third proportional to 3,278 and 4,209 is: 5,404.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,278 : 4,209 = 4,209 : x
  2. Step 2: Convert to fraction form
    3,278/4,209 = 4,209/x
  3. Step 3: Cross multiply
    3,278x = 4,209 × 4,209
  4. Step 4: Simplify right side
    3,278x = 17,715,681
  5. Step 5: Solve for x
    x = 17,715,681/3,278
  6. Step 6: Final answer
    x = 5,404.42

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.