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Finding the Third Proportional to 3,998 and 9,415

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Solution

The third proportional to 3,998 and 9,415 is: 22,171.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,998 : 9,415 = 9,415 : x
  2. Step 2: Convert to fraction form
    3,998/9,415 = 9,415/x
  3. Step 3: Cross multiply
    3,998x = 9,415 × 9,415
  4. Step 4: Simplify right side
    3,998x = 88,642,225
  5. Step 5: Solve for x
    x = 88,642,225/3,998
  6. Step 6: Final answer
    x = 22,171.64

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Why These Related Problems?

These problems maintain the same ratio (2.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.