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Finding the Third Proportional to 17,220 and 18,732

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Solution

The third proportional to 17,220 and 18,732 is: 20,376.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,220 : 18,732 = 18,732 : x
  2. Step 2: Convert to fraction form
    17,220/18,732 = 18,732/x
  3. Step 3: Cross multiply
    17,220x = 18,732 × 18,732
  4. Step 4: Simplify right side
    17,220x = 350,887,824
  5. Step 5: Solve for x
    x = 350,887,824/17,220
  6. Step 6: Final answer
    x = 20,376.76

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.