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Finding the Fourth Proportional to 490.26, 676.55 and 291.23

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Solution

The fourth proportional to 490.26, 676.55 and 291.23 is: 401.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.26 : 676.55 = 291.23 : x
  2. Step 2: Convert to fraction form
    490.26/676.55 = 291.23/x
  3. Step 3: Cross multiply
    490.26x = 676.55 × 291.23
  4. Step 4: Simplify right side
    490.26x = 197,026.82
  5. Step 5: Solve for x
    x = 197,026.82/490.26
  6. Step 6: Final answer
    x = 401.88

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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.