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Finding the Third Proportional to 128.25 and 294.75

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Solution

The third proportional to 128.25 and 294.75 is: 677.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.25 : 294.75 = 294.75 : x
  2. Step 2: Convert to fraction form
    128.25/294.75 = 294.75/x
  3. Step 3: Cross multiply
    128.25x = 294.75 × 294.75
  4. Step 4: Simplify right side
    128.25x = 86,877.56
  5. Step 5: Solve for x
    x = 86,877.56/128.25
  6. Step 6: Final answer
    x = 677.41

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Why These Related Problems?

These problems maintain the same ratio (2.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.