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Finding the Third Proportional to 2,105 and 3,158

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Solution

The third proportional to 2,105 and 3,158 is: 4,737.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105 : 3,158 = 3,158 : x
  2. Step 2: Convert to fraction form
    2,105/3,158 = 3,158/x
  3. Step 3: Cross multiply
    2,105x = 3,158 × 3,158
  4. Step 4: Simplify right side
    2,105x = 9,972,964
  5. Step 5: Solve for x
    x = 9,972,964/2,105
  6. Step 6: Final answer
    x = 4,737.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.