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Finding the Fourth Proportional to 490.34, 676.71 and 303.79

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Solution

The fourth proportional to 490.34, 676.71 and 303.79 is: 419.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.34 : 676.71 = 303.79 : x
  2. Step 2: Convert to fraction form
    490.34/676.71 = 303.79/x
  3. Step 3: Cross multiply
    490.34x = 676.71 × 303.79
  4. Step 4: Simplify right side
    490.34x = 205,577.73
  5. Step 5: Solve for x
    x = 205,577.73/490.34
  6. Step 6: Final answer
    x = 419.26

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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.