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Finding the Third Proportional to 128.75 and 232.75

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Solution

The third proportional to 128.75 and 232.75 is: 420.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.75 : 232.75 = 232.75 : x
  2. Step 2: Convert to fraction form
    128.75/232.75 = 232.75/x
  3. Step 3: Cross multiply
    128.75x = 232.75 × 232.75
  4. Step 4: Simplify right side
    128.75x = 54,172.56
  5. Step 5: Solve for x
    x = 54,172.56/128.75
  6. Step 6: Final answer
    x = 420.76

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Why These Related Problems?

These problems maintain the same ratio (1.81) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.