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Finding the Fourth Proportional to 171.15, 256.19 and 89.88

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Solution

The fourth proportional to 171.15, 256.19 and 89.88 is: 134.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.15 : 256.19 = 89.88 : x
  2. Step 2: Convert to fraction form
    171.15/256.19 = 89.88/x
  3. Step 3: Cross multiply
    171.15x = 256.19 × 89.88
  4. Step 4: Simplify right side
    171.15x = 23,025.91
  5. Step 5: Solve for x
    x = 23,025.91/171.15
  6. Step 6: Final answer
    x = 134.54

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