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Finding the Third Proportional to 128.67 and 197.44

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Solution

The third proportional to 128.67 and 197.44 is: 302.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.67 : 197.44 = 197.44 : x
  2. Step 2: Convert to fraction form
    128.67/197.44 = 197.44/x
  3. Step 3: Cross multiply
    128.67x = 197.44 × 197.44
  4. Step 4: Simplify right side
    128.67x = 38,981.57
  5. Step 5: Solve for x
    x = 38,981.57/128.67
  6. Step 6: Final answer
    x = 302.95

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.