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Finding the Third Proportional to 865 and 2,087

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Solution

The third proportional to 865 and 2,087 is: 5,035.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    865 : 2,087 = 2,087 : x
  2. Step 2: Convert to fraction form
    865/2,087 = 2,087/x
  3. Step 3: Cross multiply
    865x = 2,087 × 2,087
  4. Step 4: Simplify right side
    865x = 4,355,569
  5. Step 5: Solve for x
    x = 4,355,569/865
  6. Step 6: Final answer
    x = 5,035.34

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Why These Related Problems?

These problems maintain the same ratio (2.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.