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Finding the Third Proportional to 13,187 and 20,172

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Solution

The third proportional to 13,187 and 20,172 is: 30,856.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,187 : 20,172 = 20,172 : x
  2. Step 2: Convert to fraction form
    13,187/20,172 = 20,172/x
  3. Step 3: Cross multiply
    13,187x = 20,172 × 20,172
  4. Step 4: Simplify right side
    13,187x = 406,909,584
  5. Step 5: Solve for x
    x = 406,909,584/13,187
  6. Step 6: Final answer
    x = 30,856.87

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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.