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Finding the Third Proportional to 13,211 and 21,243

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Solution

The third proportional to 13,211 and 21,243 is: 34,158.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,211 : 21,243 = 21,243 : x
  2. Step 2: Convert to fraction form
    13,211/21,243 = 21,243/x
  3. Step 3: Cross multiply
    13,211x = 21,243 × 21,243
  4. Step 4: Simplify right side
    13,211x = 451,265,049
  5. Step 5: Solve for x
    x = 451,265,049/13,211
  6. Step 6: Final answer
    x = 34,158.28

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.