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Finding the Fourth Proportional to 104.05, 156.07 and 31.91

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Solution

The fourth proportional to 104.05, 156.07 and 31.91 is: 47.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.05 : 156.07 = 31.91 : x
  2. Step 2: Convert to fraction form
    104.05/156.07 = 31.91/x
  3. Step 3: Cross multiply
    104.05x = 156.07 × 31.91
  4. Step 4: Simplify right side
    104.05x = 4,979.41
  5. Step 5: Solve for x
    x = 4,979.41/104.05
  6. Step 6: Final answer
    x = 47.86

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