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Finding the Third Proportional to 339.38 and 660.75

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Solution

The third proportional to 339.38 and 660.75 is: 1,286.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.38 : 660.75 = 660.75 : x
  2. Step 2: Convert to fraction form
    339.38/660.75 = 660.75/x
  3. Step 3: Cross multiply
    339.38x = 660.75 × 660.75
  4. Step 4: Simplify right side
    339.38x = 436,590.56
  5. Step 5: Solve for x
    x = 436,590.56/339.38
  6. Step 6: Final answer
    x = 1,286.45

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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.