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Finding the Fourth Proportional to 402.72, 603.84 and 274.56

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Solution

The fourth proportional to 402.72, 603.84 and 274.56 is: 411.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.72 : 603.84 = 274.56 : x
  2. Step 2: Convert to fraction form
    402.72/603.84 = 274.56/x
  3. Step 3: Cross multiply
    402.72x = 603.84 × 274.56
  4. Step 4: Simplify right side
    402.72x = 165,790.31
  5. Step 5: Solve for x
    x = 165,790.31/402.72
  6. Step 6: Final answer
    x = 411.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.