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Finding the Third Proportional to 1,115 and 1,838

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Solution

The third proportional to 1,115 and 1,838 is: 3,029.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115 : 1,838 = 1,838 : x
  2. Step 2: Convert to fraction form
    1,115/1,838 = 1,838/x
  3. Step 3: Cross multiply
    1,115x = 1,838 × 1,838
  4. Step 4: Simplify right side
    1,115x = 3,378,244
  5. Step 5: Solve for x
    x = 3,378,244/1,115
  6. Step 6: Final answer
    x = 3,029.82

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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.