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Finding the Third Proportional to 129.50 and 211.38

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Solution

The third proportional to 129.50 and 211.38 is: 345.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.50 : 211.38 = 211.38 : x
  2. Step 2: Convert to fraction form
    129.50/211.38 = 211.38/x
  3. Step 3: Cross multiply
    129.50x = 211.38 × 211.38
  4. Step 4: Simplify right side
    129.50x = 44,679.39
  5. Step 5: Solve for x
    x = 44,679.39/129.50
  6. Step 6: Final answer
    x = 345.01

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.