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Finding the Third Proportional to 2,120 and 2,831

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Solution

The third proportional to 2,120 and 2,831 is: 3,780.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120 : 2,831 = 2,831 : x
  2. Step 2: Convert to fraction form
    2,120/2,831 = 2,831/x
  3. Step 3: Cross multiply
    2,120x = 2,831 × 2,831
  4. Step 4: Simplify right side
    2,120x = 8,014,561
  5. Step 5: Solve for x
    x = 8,014,561/2,120
  6. Step 6: Final answer
    x = 3,780.45

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.