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Finding the Third Proportional to 67.75 and 128.19

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Solution

The third proportional to 67.75 and 128.19 is: 242.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.75 : 128.19 = 128.19 : x
  2. Step 2: Convert to fraction form
    67.75/128.19 = 128.19/x
  3. Step 3: Cross multiply
    67.75x = 128.19 × 128.19
  4. Step 4: Simplify right side
    67.75x = 16,432.04
  5. Step 5: Solve for x
    x = 16,432.04/67.75
  6. Step 6: Final answer
    x = 242.54

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Why These Related Problems?

These problems maintain the same ratio (1.89) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.