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Finding the Third Proportional to 13,486 and 20,699

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Solution

The third proportional to 13,486 and 20,699 is: 31,769.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,486 : 20,699 = 20,699 : x
  2. Step 2: Convert to fraction form
    13,486/20,699 = 20,699/x
  3. Step 3: Cross multiply
    13,486x = 20,699 × 20,699
  4. Step 4: Simplify right side
    13,486x = 428,448,601
  5. Step 5: Solve for x
    x = 428,448,601/13,486
  6. Step 6: Final answer
    x = 31,769.88

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.