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Finding the Third Proportional to 15,542 and 20,990

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Solution

The third proportional to 15,542 and 20,990 is: 28,347.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,542 : 20,990 = 20,990 : x
  2. Step 2: Convert to fraction form
    15,542/20,990 = 20,990/x
  3. Step 3: Cross multiply
    15,542x = 20,990 × 20,990
  4. Step 4: Simplify right side
    15,542x = 440,580,100
  5. Step 5: Solve for x
    x = 440,580,100/15,542
  6. Step 6: Final answer
    x = 28,347.71

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.