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Finding the Third Proportional to 128.57 and 187.66

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Solution

The third proportional to 128.57 and 187.66 is: 273.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.57 : 187.66 = 187.66 : x
  2. Step 2: Convert to fraction form
    128.57/187.66 = 187.66/x
  3. Step 3: Cross multiply
    128.57x = 187.66 × 187.66
  4. Step 4: Simplify right side
    128.57x = 35,217.80
  5. Step 5: Solve for x
    x = 35,217.80/128.57
  6. Step 6: Final answer
    x = 273.93

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.