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Finding the Third Proportional to 393.50 and 422.75

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Solution

The third proportional to 393.50 and 422.75 is: 454.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.50 : 422.75 = 422.75 : x
  2. Step 2: Convert to fraction form
    393.50/422.75 = 422.75/x
  3. Step 3: Cross multiply
    393.50x = 422.75 × 422.75
  4. Step 4: Simplify right side
    393.50x = 178,717.56
  5. Step 5: Solve for x
    x = 178,717.56/393.50
  6. Step 6: Final answer
    x = 454.17

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Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.