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Finding the Fourth Proportional to 72.53, 108.79 and 31.94

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Solution

The fourth proportional to 72.53, 108.79 and 31.94 is: 47.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.53 : 108.79 = 31.94 : x
  2. Step 2: Convert to fraction form
    72.53/108.79 = 31.94/x
  3. Step 3: Cross multiply
    72.53x = 108.79 × 31.94
  4. Step 4: Simplify right side
    72.53x = 3,474.05
  5. Step 5: Solve for x
    x = 3,474.05/72.53
  6. Step 6: Final answer
    x = 47.90

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