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Finding the Fourth Proportional to 490.54, 676.97 and 280.75

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Solution

The fourth proportional to 490.54, 676.97 and 280.75 is: 387.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.54 : 676.97 = 280.75 : x
  2. Step 2: Convert to fraction form
    490.54/676.97 = 280.75/x
  3. Step 3: Cross multiply
    490.54x = 676.97 × 280.75
  4. Step 4: Simplify right side
    490.54x = 190,059.33
  5. Step 5: Solve for x
    x = 190,059.33/490.54
  6. Step 6: Final answer
    x = 387.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.