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Finding the Third Proportional to 17,212 and 18,988

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Solution

The third proportional to 17,212 and 18,988 is: 20,947.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,212 : 18,988 = 18,988 : x
  2. Step 2: Convert to fraction form
    17,212/18,988 = 18,988/x
  3. Step 3: Cross multiply
    17,212x = 18,988 × 18,988
  4. Step 4: Simplify right side
    17,212x = 360,544,144
  5. Step 5: Solve for x
    x = 360,544,144/17,212
  6. Step 6: Final answer
    x = 20,947.25

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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.