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Finding the Third Proportional to 122.75 and 281.50

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Solution

The third proportional to 122.75 and 281.50 is: 645.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.75 : 281.50 = 281.50 : x
  2. Step 2: Convert to fraction form
    122.75/281.50 = 281.50/x
  3. Step 3: Cross multiply
    122.75x = 281.50 × 281.50
  4. Step 4: Simplify right side
    122.75x = 79,242.25
  5. Step 5: Solve for x
    x = 79,242.25/122.75
  6. Step 6: Final answer
    x = 645.56

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Why These Related Problems?

These problems maintain the same ratio (2.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.