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Finding the Third Proportional to 17,120 and 18,912

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Solution

The third proportional to 17,120 and 18,912 is: 20,891.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,120 : 18,912 = 18,912 : x
  2. Step 2: Convert to fraction form
    17,120/18,912 = 18,912/x
  3. Step 3: Cross multiply
    17,120x = 18,912 × 18,912
  4. Step 4: Simplify right side
    17,120x = 357,663,744
  5. Step 5: Solve for x
    x = 357,663,744/17,120
  6. Step 6: Final answer
    x = 20,891.57

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.