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Finding the Third Proportional to 111 and 216.38

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Solution

The third proportional to 111 and 216.38 is: 421.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    111 : 216.38 = 216.38 : x
  2. Step 2: Convert to fraction form
    111/216.38 = 216.38/x
  3. Step 3: Cross multiply
    111x = 216.38 × 216.38
  4. Step 4: Simplify right side
    111x = 46,818.14
  5. Step 5: Solve for x
    x = 46,818.14/111
  6. Step 6: Final answer
    x = 421.79

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Why These Related Problems?

These problems maintain the same ratio (1.95) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.