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Finding the Fourth Proportional to 408.06, 612.02 and 115.61

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Solution

The fourth proportional to 408.06, 612.02 and 115.61 is: 173.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.06 : 612.02 = 115.61 : x
  2. Step 2: Convert to fraction form
    408.06/612.02 = 115.61/x
  3. Step 3: Cross multiply
    408.06x = 612.02 × 115.61
  4. Step 4: Simplify right side
    408.06x = 70,752.86
  5. Step 5: Solve for x
    x = 70,752.86/408.06
  6. Step 6: Final answer
    x = 173.39

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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.