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Finding the Third Proportional to 278.75 and 378

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Solution

The third proportional to 278.75 and 378 is: 512.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.75 : 378 = 378 : x
  2. Step 2: Convert to fraction form
    278.75/378 = 378/x
  3. Step 3: Cross multiply
    278.75x = 378 × 378
  4. Step 4: Simplify right side
    278.75x = 142,884
  5. Step 5: Solve for x
    x = 142,884/278.75
  6. Step 6: Final answer
    x = 512.59

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These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.