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Finding the Third Proportional to 129.13 and 209.75

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Solution

The third proportional to 129.13 and 209.75 is: 340.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.13 : 209.75 = 209.75 : x
  2. Step 2: Convert to fraction form
    129.13/209.75 = 209.75/x
  3. Step 3: Cross multiply
    129.13x = 209.75 × 209.75
  4. Step 4: Simplify right side
    129.13x = 43,995.06
  5. Step 5: Solve for x
    x = 43,995.06/129.13
  6. Step 6: Final answer
    x = 340.72

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Why These Related Problems?

These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.