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Finding the Third Proportional to 18,990 and 40,422

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Solution

The third proportional to 18,990 and 40,422 is: 86,042.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990 : 40,422 = 40,422 : x
  2. Step 2: Convert to fraction form
    18,990/40,422 = 40,422/x
  3. Step 3: Cross multiply
    18,990x = 40,422 × 40,422
  4. Step 4: Simplify right side
    18,990x = 1,633,938,084
  5. Step 5: Solve for x
    x = 1,633,938,084/18,990
  6. Step 6: Final answer
    x = 86,042.03

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.