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Finding the Fourth Proportional to 490.22, 676.48 and 280.38

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Solution

The fourth proportional to 490.22, 676.48 and 280.38 is: 386.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.22 : 676.48 = 280.38 : x
  2. Step 2: Convert to fraction form
    490.22/676.48 = 280.38/x
  3. Step 3: Cross multiply
    490.22x = 676.48 × 280.38
  4. Step 4: Simplify right side
    490.22x = 189,671.46
  5. Step 5: Solve for x
    x = 189,671.46/490.22
  6. Step 6: Final answer
    x = 386.91

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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.