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Finding the Fourth Proportional to 490.56, 676.32 and 428.64

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Solution

The fourth proportional to 490.56, 676.32 and 428.64 is: 590.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.56 : 676.32 = 428.64 : x
  2. Step 2: Convert to fraction form
    490.56/676.32 = 428.64/x
  3. Step 3: Cross multiply
    490.56x = 676.32 × 428.64
  4. Step 4: Simplify right side
    490.56x = 289,897.80
  5. Step 5: Solve for x
    x = 289,897.80/490.56
  6. Step 6: Final answer
    x = 590.95

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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.