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Finding the Third Proportional to 869 and 1,859

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Solution

The third proportional to 869 and 1,859 is: 3,976.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    869 : 1,859 = 1,859 : x
  2. Step 2: Convert to fraction form
    869/1,859 = 1,859/x
  3. Step 3: Cross multiply
    869x = 1,859 × 1,859
  4. Step 4: Simplify right side
    869x = 3,455,881
  5. Step 5: Solve for x
    x = 3,455,881/869
  6. Step 6: Final answer
    x = 3,976.85

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.