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Finding the Third Proportional to 311 and 461.25

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Solution

The third proportional to 311 and 461.25 is: 684.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    311 : 461.25 = 461.25 : x
  2. Step 2: Convert to fraction form
    311/461.25 = 461.25/x
  3. Step 3: Cross multiply
    311x = 461.25 × 461.25
  4. Step 4: Simplify right side
    311x = 212,751.56
  5. Step 5: Solve for x
    x = 212,751.56/311
  6. Step 6: Final answer
    x = 684.09

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.