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Finding the Third Proportional to 306.75 and 398.06

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Solution

The third proportional to 306.75 and 398.06 is: 516.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.75 : 398.06 = 398.06 : x
  2. Step 2: Convert to fraction form
    306.75/398.06 = 398.06/x
  3. Step 3: Cross multiply
    306.75x = 398.06 × 398.06
  4. Step 4: Simplify right side
    306.75x = 158,453.75
  5. Step 5: Solve for x
    x = 158,453.75/306.75
  6. Step 6: Final answer
    x = 516.56

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.