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Finding the Third Proportional to 17,790 and 38,620

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Solution

The third proportional to 17,790 and 38,620 is: 83,839.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,790 : 38,620 = 38,620 : x
  2. Step 2: Convert to fraction form
    17,790/38,620 = 38,620/x
  3. Step 3: Cross multiply
    17,790x = 38,620 × 38,620
  4. Step 4: Simplify right side
    17,790x = 1,491,504,400
  5. Step 5: Solve for x
    x = 1,491,504,400/17,790
  6. Step 6: Final answer
    x = 83,839.48

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.