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Finding the Third Proportional to 128.38 and 197.38

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Solution

The third proportional to 128.38 and 197.38 is: 303.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.38 : 197.38 = 197.38 : x
  2. Step 2: Convert to fraction form
    128.38/197.38 = 197.38/x
  3. Step 3: Cross multiply
    128.38x = 197.38 × 197.38
  4. Step 4: Simplify right side
    128.38x = 38,956.89
  5. Step 5: Solve for x
    x = 38,956.89/128.38
  6. Step 6: Final answer
    x = 303.46

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.