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Finding the Fourth Proportional to 490.48, 676.79 and 391.14

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Solution

The fourth proportional to 490.48, 676.79 and 391.14 is: 539.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.48 : 676.79 = 391.14 : x
  2. Step 2: Convert to fraction form
    490.48/676.79 = 391.14/x
  3. Step 3: Cross multiply
    490.48x = 676.79 × 391.14
  4. Step 4: Simplify right side
    490.48x = 264,722.31
  5. Step 5: Solve for x
    x = 264,722.31/490.48
  6. Step 6: Final answer
    x = 539.72

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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.