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Finding the Third Proportional to 238.88 and 318.38

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Solution

The third proportional to 238.88 and 318.38 is: 424.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.88 : 318.38 = 318.38 : x
  2. Step 2: Convert to fraction form
    238.88/318.38 = 318.38/x
  3. Step 3: Cross multiply
    238.88x = 318.38 × 318.38
  4. Step 4: Simplify right side
    238.88x = 101,362.64
  5. Step 5: Solve for x
    x = 101,362.64/238.88
  6. Step 6: Final answer
    x = 424.33

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.