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Finding the Third Proportional to 18,660 and 38,900

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Solution

The third proportional to 18,660 and 38,900 is: 81,093.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,660 : 38,900 = 38,900 : x
  2. Step 2: Convert to fraction form
    18,660/38,900 = 38,900/x
  3. Step 3: Cross multiply
    18,660x = 38,900 × 38,900
  4. Step 4: Simplify right side
    18,660x = 1,513,210,000
  5. Step 5: Solve for x
    x = 1,513,210,000/18,660
  6. Step 6: Final answer
    x = 81,093.78

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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.