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Finding the Third Proportional to 17,920 and 39,408

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Solution

The third proportional to 17,920 and 39,408 is: 86,662.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,920 : 39,408 = 39,408 : x
  2. Step 2: Convert to fraction form
    17,920/39,408 = 39,408/x
  3. Step 3: Cross multiply
    17,920x = 39,408 × 39,408
  4. Step 4: Simplify right side
    17,920x = 1,552,990,464
  5. Step 5: Solve for x
    x = 1,552,990,464/17,920
  6. Step 6: Final answer
    x = 86,662.41

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.