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Finding the Third Proportional to 1,990 and 3,279

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Solution

The third proportional to 1,990 and 3,279 is: 5,402.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990 : 3,279 = 3,279 : x
  2. Step 2: Convert to fraction form
    1,990/3,279 = 3,279/x
  3. Step 3: Cross multiply
    1,990x = 3,279 × 3,279
  4. Step 4: Simplify right side
    1,990x = 10,751,841
  5. Step 5: Solve for x
    x = 10,751,841/1,990
  6. Step 6: Final answer
    x = 5,402.94

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.