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Finding the Fourth Proportional to 391.76, 587.82 and 199.28

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Solution

The fourth proportional to 391.76, 587.82 and 199.28 is: 299.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.76 : 587.82 = 199.28 : x
  2. Step 2: Convert to fraction form
    391.76/587.82 = 199.28/x
  3. Step 3: Cross multiply
    391.76x = 587.82 × 199.28
  4. Step 4: Simplify right side
    391.76x = 117,140.77
  5. Step 5: Solve for x
    x = 117,140.77/391.76
  6. Step 6: Final answer
    x = 299.01

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