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Finding the Third Proportional to 311.25 and 378

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Solution

The third proportional to 311.25 and 378 is: 459.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.25 : 378 = 378 : x
  2. Step 2: Convert to fraction form
    311.25/378 = 378/x
  3. Step 3: Cross multiply
    311.25x = 378 × 378
  4. Step 4: Simplify right side
    311.25x = 142,884
  5. Step 5: Solve for x
    x = 142,884/311.25
  6. Step 6: Final answer
    x = 459.07

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.