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Finding the Fourth Proportional to 559.13, 771.65 and 310.53

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Solution

The fourth proportional to 559.13, 771.65 and 310.53 is: 428.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.13 : 771.65 = 310.53 : x
  2. Step 2: Convert to fraction form
    559.13/771.65 = 310.53/x
  3. Step 3: Cross multiply
    559.13x = 771.65 × 310.53
  4. Step 4: Simplify right side
    559.13x = 239,620.47
  5. Step 5: Solve for x
    x = 239,620.47/559.13
  6. Step 6: Final answer
    x = 428.56

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