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Finding the Fourth Proportional to 171.13, 256.59 and 79.88

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Solution

The fourth proportional to 171.13, 256.59 and 79.88 is: 119.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.13 : 256.59 = 79.88 : x
  2. Step 2: Convert to fraction form
    171.13/256.59 = 79.88/x
  3. Step 3: Cross multiply
    171.13x = 256.59 × 79.88
  4. Step 4: Simplify right side
    171.13x = 20,496.41
  5. Step 5: Solve for x
    x = 20,496.41/171.13
  6. Step 6: Final answer
    x = 119.77

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