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Finding the Fourth Proportional to 490.21, 676.42 and 269.15

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Solution

The fourth proportional to 490.21, 676.42 and 269.15 is: 371.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.21 : 676.42 = 269.15 : x
  2. Step 2: Convert to fraction form
    490.21/676.42 = 269.15/x
  3. Step 3: Cross multiply
    490.21x = 676.42 × 269.15
  4. Step 4: Simplify right side
    490.21x = 182,054.39
  5. Step 5: Solve for x
    x = 182,054.39/490.21
  6. Step 6: Final answer
    x = 371.38

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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.