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Finding the Fourth Proportional to 353.28, 487.70 and 274.42

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Solution

The fourth proportional to 353.28, 487.70 and 274.42 is: 378.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.28 : 487.70 = 274.42 : x
  2. Step 2: Convert to fraction form
    353.28/487.70 = 274.42/x
  3. Step 3: Cross multiply
    353.28x = 487.70 × 274.42
  4. Step 4: Simplify right side
    353.28x = 133,834.63
  5. Step 5: Solve for x
    x = 133,834.63/353.28
  6. Step 6: Final answer
    x = 378.83

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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.