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Finding the Third Proportional to 129.25 and 202.88

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Solution

The third proportional to 129.25 and 202.88 is: 318.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.25 : 202.88 = 202.88 : x
  2. Step 2: Convert to fraction form
    129.25/202.88 = 202.88/x
  3. Step 3: Cross multiply
    129.25x = 202.88 × 202.88
  4. Step 4: Simplify right side
    129.25x = 41,158.27
  5. Step 5: Solve for x
    x = 41,158.27/129.25
  6. Step 6: Final answer
    x = 318.44

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.