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Finding the Third Proportional to 18,920 and 39,392

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Solution

The third proportional to 18,920 and 39,392 is: 82,015.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,920 : 39,392 = 39,392 : x
  2. Step 2: Convert to fraction form
    18,920/39,392 = 39,392/x
  3. Step 3: Cross multiply
    18,920x = 39,392 × 39,392
  4. Step 4: Simplify right side
    18,920x = 1,551,729,664
  5. Step 5: Solve for x
    x = 1,551,729,664/18,920
  6. Step 6: Final answer
    x = 82,015.31

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.