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Finding the Third Proportional to 239.75 and 316.75

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Solution

The third proportional to 239.75 and 316.75 is: 418.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.75 : 316.75 = 316.75 : x
  2. Step 2: Convert to fraction form
    239.75/316.75 = 316.75/x
  3. Step 3: Cross multiply
    239.75x = 316.75 × 316.75
  4. Step 4: Simplify right side
    239.75x = 100,330.56
  5. Step 5: Solve for x
    x = 100,330.56/239.75
  6. Step 6: Final answer
    x = 418.48

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.