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Finding the Third Proportional to 238.31 and 310.78

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Solution

The third proportional to 238.31 and 310.78 is: 405.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.31 : 310.78 = 310.78 : x
  2. Step 2: Convert to fraction form
    238.31/310.78 = 310.78/x
  3. Step 3: Cross multiply
    238.31x = 310.78 × 310.78
  4. Step 4: Simplify right side
    238.31x = 96,584.99
  5. Step 5: Solve for x
    x = 96,584.99/238.31
  6. Step 6: Final answer
    x = 405.29

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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.