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Finding the Third Proportional to 140 and 247.75

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Solution

The third proportional to 140 and 247.75 is: 438.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    140 : 247.75 = 247.75 : x
  2. Step 2: Convert to fraction form
    140/247.75 = 247.75/x
  3. Step 3: Cross multiply
    140x = 247.75 × 247.75
  4. Step 4: Simplify right side
    140x = 61,380.06
  5. Step 5: Solve for x
    x = 61,380.06/140
  6. Step 6: Final answer
    x = 438.43

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Why These Related Problems?

These problems maintain the same ratio (1.77) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.