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Finding the Fourth Proportional to 407.31, 611.08 and 199.09

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Solution

The fourth proportional to 407.31, 611.08 and 199.09 is: 298.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.31 : 611.08 = 199.09 : x
  2. Step 2: Convert to fraction form
    407.31/611.08 = 199.09/x
  3. Step 3: Cross multiply
    407.31x = 611.08 × 199.09
  4. Step 4: Simplify right side
    407.31x = 121,658.89
  5. Step 5: Solve for x
    x = 121,658.89/407.31
  6. Step 6: Final answer
    x = 298.69

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