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Finding the Third Proportional to 12,128 and 18,170

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Solution

The third proportional to 12,128 and 18,170 is: 27,222.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,128 : 18,170 = 18,170 : x
  2. Step 2: Convert to fraction form
    12,128/18,170 = 18,170/x
  3. Step 3: Cross multiply
    12,128x = 18,170 × 18,170
  4. Step 4: Simplify right side
    12,128x = 330,148,900
  5. Step 5: Solve for x
    x = 330,148,900/12,128
  6. Step 6: Final answer
    x = 27,222.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.