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Finding the Third Proportional to 20,211 and 28,431

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Solution

The third proportional to 20,211 and 28,431 is: 39,994.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,211 : 28,431 = 28,431 : x
  2. Step 2: Convert to fraction form
    20,211/28,431 = 28,431/x
  3. Step 3: Cross multiply
    20,211x = 28,431 × 28,431
  4. Step 4: Simplify right side
    20,211x = 808,321,761
  5. Step 5: Solve for x
    x = 808,321,761/20,211
  6. Step 6: Final answer
    x = 39,994.15

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.