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Finding the Fourth Proportional to 490.38, 676.75 and 291.28

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Solution

The fourth proportional to 490.38, 676.75 and 291.28 is: 401.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.38 : 676.75 = 291.28 : x
  2. Step 2: Convert to fraction form
    490.38/676.75 = 291.28/x
  3. Step 3: Cross multiply
    490.38x = 676.75 × 291.28
  4. Step 4: Simplify right side
    490.38x = 197,123.74
  5. Step 5: Solve for x
    x = 197,123.74/490.38
  6. Step 6: Final answer
    x = 401.98

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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.