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Finding the Fourth Proportional to 471.91, 708.38 and 289.78

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Solution

The fourth proportional to 471.91, 708.38 and 289.78 is: 434.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.91 : 708.38 = 289.78 : x
  2. Step 2: Convert to fraction form
    471.91/708.38 = 289.78/x
  3. Step 3: Cross multiply
    471.91x = 708.38 × 289.78
  4. Step 4: Simplify right side
    471.91x = 205,273.45
  5. Step 5: Solve for x
    x = 205,273.45/471.91
  6. Step 6: Final answer
    x = 434.98

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