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Finding the Fourth Proportional to 411.12, 613.86 and 408.72

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Solution

The fourth proportional to 411.12, 613.86 and 408.72 is: 610.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.12 : 613.86 = 408.72 : x
  2. Step 2: Convert to fraction form
    411.12/613.86 = 408.72/x
  3. Step 3: Cross multiply
    411.12x = 613.86 × 408.72
  4. Step 4: Simplify right side
    411.12x = 250,896.86
  5. Step 5: Solve for x
    x = 250,896.86/411.12
  6. Step 6: Final answer
    x = 610.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.