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Finding the Fourth Proportional to 92.70, 139.05 and 31.83

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Solution

The fourth proportional to 92.70, 139.05 and 31.83 is: 47.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.70 : 139.05 = 31.83 : x
  2. Step 2: Convert to fraction form
    92.70/139.05 = 31.83/x
  3. Step 3: Cross multiply
    92.70x = 139.05 × 31.83
  4. Step 4: Simplify right side
    92.70x = 4,425.96
  5. Step 5: Solve for x
    x = 4,425.96/92.70
  6. Step 6: Final answer
    x = 47.75

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