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Finding the Third Proportional to 18,880 and 20,770

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Solution

The third proportional to 18,880 and 20,770 is: 22,849.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,880 : 20,770 = 20,770 : x
  2. Step 2: Convert to fraction form
    18,880/20,770 = 20,770/x
  3. Step 3: Cross multiply
    18,880x = 20,770 × 20,770
  4. Step 4: Simplify right side
    18,880x = 431,392,900
  5. Step 5: Solve for x
    x = 431,392,900/18,880
  6. Step 6: Final answer
    x = 22,849.20

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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.