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Finding the Fourth Proportional to 385.44, 531.91 and 230.19

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Solution

The fourth proportional to 385.44, 531.91 and 230.19 is: 317.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.44 : 531.91 = 230.19 : x
  2. Step 2: Convert to fraction form
    385.44/531.91 = 230.19/x
  3. Step 3: Cross multiply
    385.44x = 531.91 × 230.19
  4. Step 4: Simplify right side
    385.44x = 122,437.88
  5. Step 5: Solve for x
    x = 122,437.88/385.44
  6. Step 6: Final answer
    x = 317.66

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