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Finding the Third Proportional to 143.25 and 308.63

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Solution

The third proportional to 143.25 and 308.63 is: 664.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.25 : 308.63 = 308.63 : x
  2. Step 2: Convert to fraction form
    143.25/308.63 = 308.63/x
  3. Step 3: Cross multiply
    143.25x = 308.63 × 308.63
  4. Step 4: Simplify right side
    143.25x = 95,249.39
  5. Step 5: Solve for x
    x = 95,249.39/143.25
  6. Step 6: Final answer
    x = 664.92

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.