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Finding the Third Proportional to 3,900 and 5,286

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Solution

The third proportional to 3,900 and 5,286 is: 7,164.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900 : 5,286 = 5,286 : x
  2. Step 2: Convert to fraction form
    3,900/5,286 = 5,286/x
  3. Step 3: Cross multiply
    3,900x = 5,286 × 5,286
  4. Step 4: Simplify right side
    3,900x = 27,941,796
  5. Step 5: Solve for x
    x = 27,941,796/3,900
  6. Step 6: Final answer
    x = 7,164.56

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.