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Finding the Fourth Proportional to 129.72, 178.96 and 85.98

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Solution

The fourth proportional to 129.72, 178.96 and 85.98 is: 118.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.72 : 178.96 = 85.98 : x
  2. Step 2: Convert to fraction form
    129.72/178.96 = 85.98/x
  3. Step 3: Cross multiply
    129.72x = 178.96 × 85.98
  4. Step 4: Simplify right side
    129.72x = 15,387.64
  5. Step 5: Solve for x
    x = 15,387.64/129.72
  6. Step 6: Final answer
    x = 118.62

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