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Finding the Third Proportional to 129 and 167.50

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Solution

The third proportional to 129 and 167.50 is: 217.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    129 : 167.50 = 167.50 : x
  2. Step 2: Convert to fraction form
    129/167.50 = 167.50/x
  3. Step 3: Cross multiply
    129x = 167.50 × 167.50
  4. Step 4: Simplify right side
    129x = 28,056.25
  5. Step 5: Solve for x
    x = 28,056.25/129
  6. Step 6: Final answer
    x = 217.49

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.