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Finding the Third Proportional to 20,605 and 27,990

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Solution

The third proportional to 20,605 and 27,990 is: 38,021.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,605 : 27,990 = 27,990 : x
  2. Step 2: Convert to fraction form
    20,605/27,990 = 27,990/x
  3. Step 3: Cross multiply
    20,605x = 27,990 × 27,990
  4. Step 4: Simplify right side
    20,605x = 783,440,100
  5. Step 5: Solve for x
    x = 783,440,100/20,605
  6. Step 6: Final answer
    x = 38,021.84

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.