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Finding the Third Proportional to 311.25 and 411

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Solution

The third proportional to 311.25 and 411 is: 542.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.25 : 411 = 411 : x
  2. Step 2: Convert to fraction form
    311.25/411 = 411/x
  3. Step 3: Cross multiply
    311.25x = 411 × 411
  4. Step 4: Simplify right side
    311.25x = 168,921
  5. Step 5: Solve for x
    x = 168,921/311.25
  6. Step 6: Final answer
    x = 542.72

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.