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Finding the Third Proportional to 3,902 and 5,489

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Solution

The third proportional to 3,902 and 5,489 is: 7,721.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,902 : 5,489 = 5,489 : x
  2. Step 2: Convert to fraction form
    3,902/5,489 = 5,489/x
  3. Step 3: Cross multiply
    3,902x = 5,489 × 5,489
  4. Step 4: Simplify right side
    3,902x = 30,129,121
  5. Step 5: Solve for x
    x = 30,129,121/3,902
  6. Step 6: Final answer
    x = 7,721.46

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.