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Finding the Third Proportional to 140.25 and 309

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Solution

The third proportional to 140.25 and 309 is: 680.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.25 : 309 = 309 : x
  2. Step 2: Convert to fraction form
    140.25/309 = 309/x
  3. Step 3: Cross multiply
    140.25x = 309 × 309
  4. Step 4: Simplify right side
    140.25x = 95,481
  5. Step 5: Solve for x
    x = 95,481/140.25
  6. Step 6: Final answer
    x = 680.79

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.