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Finding the Fourth Proportional to 353.28, 487.68 and 249.60

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Solution

The fourth proportional to 353.28, 487.68 and 249.60 is: 344.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.28 : 487.68 = 249.60 : x
  2. Step 2: Convert to fraction form
    353.28/487.68 = 249.60/x
  3. Step 3: Cross multiply
    353.28x = 487.68 × 249.60
  4. Step 4: Simplify right side
    353.28x = 121,724.93
  5. Step 5: Solve for x
    x = 121,724.93/353.28
  6. Step 6: Final answer
    x = 344.56

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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.