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Finding the Third Proportional to 218.75 and 338.38

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Solution

The third proportional to 218.75 and 338.38 is: 523.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.75 : 338.38 = 338.38 : x
  2. Step 2: Convert to fraction form
    218.75/338.38 = 338.38/x
  3. Step 3: Cross multiply
    218.75x = 338.38 × 338.38
  4. Step 4: Simplify right side
    218.75x = 114,497.64
  5. Step 5: Solve for x
    x = 114,497.64/218.75
  6. Step 6: Final answer
    x = 523.42

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.