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Finding the Third Proportional to 311.75 and 347

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Solution

The third proportional to 311.75 and 347 is: 386.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.75 : 347 = 347 : x
  2. Step 2: Convert to fraction form
    311.75/347 = 347/x
  3. Step 3: Cross multiply
    311.75x = 347 × 347
  4. Step 4: Simplify right side
    311.75x = 120,409
  5. Step 5: Solve for x
    x = 120,409/311.75
  6. Step 6: Final answer
    x = 386.24

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.