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Finding the Third Proportional to 129 and 209.50

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Solution

The third proportional to 129 and 209.50 is: 340.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    129 : 209.50 = 209.50 : x
  2. Step 2: Convert to fraction form
    129/209.50 = 209.50/x
  3. Step 3: Cross multiply
    129x = 209.50 × 209.50
  4. Step 4: Simplify right side
    129x = 43,890.25
  5. Step 5: Solve for x
    x = 43,890.25/129
  6. Step 6: Final answer
    x = 340.23

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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.