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Finding the Fourth Proportional to 81,288.67, 121,920.42 and 31,361.48

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Solution

The fourth proportional to 81,288.67, 121,920.42 and 31,361.48 is: 47,037.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,288.67 : 121,920.42 = 31,361.48 : x
  2. Step 2: Convert to fraction form
    81,288.67/121,920.42 = 31,361.48/x
  3. Step 3: Cross multiply
    81,288.67x = 121,920.42 × 31,361.48
  4. Step 4: Simplify right side
    81,288.67x = 3,823,604,813.42
  5. Step 5: Solve for x
    x = 3,823,604,813.42/81,288.67
  6. Step 6: Final answer
    x = 47,037.37

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