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Finding the Third Proportional to 20,918 and 45,121

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Solution

The third proportional to 20,918 and 45,121 is: 97,327.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918 : 45,121 = 45,121 : x
  2. Step 2: Convert to fraction form
    20,918/45,121 = 45,121/x
  3. Step 3: Cross multiply
    20,918x = 45,121 × 45,121
  4. Step 4: Simplify right side
    20,918x = 2,035,904,641
  5. Step 5: Solve for x
    x = 2,035,904,641/20,918
  6. Step 6: Final answer
    x = 97,327.88

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.