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Finding the Fourth Proportional to 391.08, 586.98 and 198.84

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Solution

The fourth proportional to 391.08, 586.98 and 198.84 is: 298.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.08 : 586.98 = 198.84 : x
  2. Step 2: Convert to fraction form
    391.08/586.98 = 198.84/x
  3. Step 3: Cross multiply
    391.08x = 586.98 × 198.84
  4. Step 4: Simplify right side
    391.08x = 116,715.10
  5. Step 5: Solve for x
    x = 116,715.10/391.08
  6. Step 6: Final answer
    x = 298.44

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