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Finding the Third Proportional to 311.75 and 512.88

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Solution

The third proportional to 311.75 and 512.88 is: 843.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.75 : 512.88 = 512.88 : x
  2. Step 2: Convert to fraction form
    311.75/512.88 = 512.88/x
  3. Step 3: Cross multiply
    311.75x = 512.88 × 512.88
  4. Step 4: Simplify right side
    311.75x = 263,040.77
  5. Step 5: Solve for x
    x = 263,040.77/311.75
  6. Step 6: Final answer
    x = 843.76

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.