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Finding the Fourth Proportional to 559.79, 839.76 and 285.73

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Solution

The fourth proportional to 559.79, 839.76 and 285.73 is: 428.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.79 : 839.76 = 285.73 : x
  2. Step 2: Convert to fraction form
    559.79/839.76 = 285.73/x
  3. Step 3: Cross multiply
    559.79x = 839.76 × 285.73
  4. Step 4: Simplify right side
    559.79x = 239,943.60
  5. Step 5: Solve for x
    x = 239,943.60/559.79
  6. Step 6: Final answer
    x = 428.64

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