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Finding the Third Proportional to 129.38 and 172.69

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Solution

The third proportional to 129.38 and 172.69 is: 230.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.38 : 172.69 = 172.69 : x
  2. Step 2: Convert to fraction form
    129.38/172.69 = 172.69/x
  3. Step 3: Cross multiply
    129.38x = 172.69 × 172.69
  4. Step 4: Simplify right side
    129.38x = 29,820.97
  5. Step 5: Solve for x
    x = 29,820.97/129.38
  6. Step 6: Final answer
    x = 230.50

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.