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Finding the Third Proportional to 1,800 and 2,811

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Solution

The third proportional to 1,800 and 2,811 is: 4,389.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,800 : 2,811 = 2,811 : x
  2. Step 2: Convert to fraction form
    1,800/2,811 = 2,811/x
  3. Step 3: Cross multiply
    1,800x = 2,811 × 2,811
  4. Step 4: Simplify right side
    1,800x = 7,901,721
  5. Step 5: Solve for x
    x = 7,901,721/1,800
  6. Step 6: Final answer
    x = 4,389.85

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.