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Finding the Third Proportional to 120 and 171

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Solution

The third proportional to 120 and 171 is: 243.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    120 : 171 = 171 : x
  2. Step 2: Convert to fraction form
    120/171 = 171/x
  3. Step 3: Cross multiply
    120x = 171 × 171
  4. Step 4: Simplify right side
    120x = 29,241
  5. Step 5: Solve for x
    x = 29,241/120
  6. Step 6: Final answer
    x = 243.68

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.