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Finding the Third Proportional to 18,390 and 27,720

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Solution

The third proportional to 18,390 and 27,720 is: 41,783.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,390 : 27,720 = 27,720 : x
  2. Step 2: Convert to fraction form
    18,390/27,720 = 27,720/x
  3. Step 3: Cross multiply
    18,390x = 27,720 × 27,720
  4. Step 4: Simplify right side
    18,390x = 768,398,400
  5. Step 5: Solve for x
    x = 768,398,400/18,390
  6. Step 6: Final answer
    x = 41,783.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.