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Finding the Third Proportional to 128 and 171

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Solution

The third proportional to 128 and 171 is: 228.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 171 = 171 : x
  2. Step 2: Convert to fraction form
    128/171 = 171/x
  3. Step 3: Cross multiply
    128x = 171 × 171
  4. Step 4: Simplify right side
    128x = 29,241
  5. Step 5: Solve for x
    x = 29,241/128
  6. Step 6: Final answer
    x = 228.45

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.