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Finding the Third Proportional to 2,891 and 3,131

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Solution

The third proportional to 2,891 and 3,131 is: 3,390.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891 : 3,131 = 3,131 : x
  2. Step 2: Convert to fraction form
    2,891/3,131 = 3,131/x
  3. Step 3: Cross multiply
    2,891x = 3,131 × 3,131
  4. Step 4: Simplify right side
    2,891x = 9,803,161
  5. Step 5: Solve for x
    x = 9,803,161/2,891
  6. Step 6: Final answer
    x = 3,390.92

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.