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Finding the Third Proportional to 21,990 and 48,902

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Solution

The third proportional to 21,990 and 48,902 is: 108,749.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990 : 48,902 = 48,902 : x
  2. Step 2: Convert to fraction form
    21,990/48,902 = 48,902/x
  3. Step 3: Cross multiply
    21,990x = 48,902 × 48,902
  4. Step 4: Simplify right side
    21,990x = 2,391,405,604
  5. Step 5: Solve for x
    x = 2,391,405,604/21,990
  6. Step 6: Final answer
    x = 108,749.69

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.