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Finding the Fourth Proportional to 423.76, 636.60 and 411.28

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Solution

The fourth proportional to 423.76, 636.60 and 411.28 is: 617.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.76 : 636.60 = 411.28 : x
  2. Step 2: Convert to fraction form
    423.76/636.60 = 411.28/x
  3. Step 3: Cross multiply
    423.76x = 636.60 × 411.28
  4. Step 4: Simplify right side
    423.76x = 261,820.85
  5. Step 5: Solve for x
    x = 261,820.85/423.76
  6. Step 6: Final answer
    x = 617.85

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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.