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Finding the Fourth Proportional to 408.16, 612.36 and 191.86

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Solution

The fourth proportional to 408.16, 612.36 and 191.86 is: 287.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.16 : 612.36 = 191.86 : x
  2. Step 2: Convert to fraction form
    408.16/612.36 = 191.86/x
  3. Step 3: Cross multiply
    408.16x = 612.36 × 191.86
  4. Step 4: Simplify right side
    408.16x = 117,487.39
  5. Step 5: Solve for x
    x = 117,487.39/408.16
  6. Step 6: Final answer
    x = 287.85

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