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Finding the Fourth Proportional to 490.57, 676.53 and 391.32

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Solution

The fourth proportional to 490.57, 676.53 and 391.32 is: 539.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.57 : 676.53 = 391.32 : x
  2. Step 2: Convert to fraction form
    490.57/676.53 = 391.32/x
  3. Step 3: Cross multiply
    490.57x = 676.53 × 391.32
  4. Step 4: Simplify right side
    490.57x = 264,739.72
  5. Step 5: Solve for x
    x = 264,739.72/490.57
  6. Step 6: Final answer
    x = 539.66

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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.