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Finding the Fourth Proportional to 230.54, 345.76 and 86.15

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Solution

The fourth proportional to 230.54, 345.76 and 86.15 is: 129.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.54 : 345.76 = 86.15 : x
  2. Step 2: Convert to fraction form
    230.54/345.76 = 86.15/x
  3. Step 3: Cross multiply
    230.54x = 345.76 × 86.15
  4. Step 4: Simplify right side
    230.54x = 29,787.87
  5. Step 5: Solve for x
    x = 29,787.87/230.54
  6. Step 6: Final answer
    x = 129.21

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