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Finding the Third Proportional to 278.50 and 391.75

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Solution

The third proportional to 278.50 and 391.75 is: 551.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.50 : 391.75 = 391.75 : x
  2. Step 2: Convert to fraction form
    278.50/391.75 = 391.75/x
  3. Step 3: Cross multiply
    278.50x = 391.75 × 391.75
  4. Step 4: Simplify right side
    278.50x = 153,468.06
  5. Step 5: Solve for x
    x = 153,468.06/278.50
  6. Step 6: Final answer
    x = 551.05

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.