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Finding the Third Proportional to 128.25 and 179.75

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Solution

The third proportional to 128.25 and 179.75 is: 251.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.25 : 179.75 = 179.75 : x
  2. Step 2: Convert to fraction form
    128.25/179.75 = 179.75/x
  3. Step 3: Cross multiply
    128.25x = 179.75 × 179.75
  4. Step 4: Simplify right side
    128.25x = 32,310.06
  5. Step 5: Solve for x
    x = 32,310.06/128.25
  6. Step 6: Final answer
    x = 251.93

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.