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Finding the Third Proportional to 238.50 and 258.75

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Solution

The third proportional to 238.50 and 258.75 is: 280.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.50 : 258.75 = 258.75 : x
  2. Step 2: Convert to fraction form
    238.50/258.75 = 258.75/x
  3. Step 3: Cross multiply
    238.50x = 258.75 × 258.75
  4. Step 4: Simplify right side
    238.50x = 66,951.56
  5. Step 5: Solve for x
    x = 66,951.56/238.50
  6. Step 6: Final answer
    x = 280.72

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.