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Finding the Third Proportional to 111 and 189

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Solution

The third proportional to 111 and 189 is: 321.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    111 : 189 = 189 : x
  2. Step 2: Convert to fraction form
    111/189 = 189/x
  3. Step 3: Cross multiply
    111x = 189 × 189
  4. Step 4: Simplify right side
    111x = 35,721
  5. Step 5: Solve for x
    x = 35,721/111
  6. Step 6: Final answer
    x = 321.81

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Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.