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Finding the Third Proportional to 13,217 and 20,418

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Solution

The third proportional to 13,217 and 20,418 is: 31,542.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,217 : 20,418 = 20,418 : x
  2. Step 2: Convert to fraction form
    13,217/20,418 = 20,418/x
  3. Step 3: Cross multiply
    13,217x = 20,418 × 20,418
  4. Step 4: Simplify right side
    13,217x = 416,894,724
  5. Step 5: Solve for x
    x = 416,894,724/13,217
  6. Step 6: Final answer
    x = 31,542.31

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.