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Finding the Fourth Proportional to 87.83, 131.84 and 51.78

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Solution

The fourth proportional to 87.83, 131.84 and 51.78 is: 77.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.83 : 131.84 = 51.78 : x
  2. Step 2: Convert to fraction form
    87.83/131.84 = 51.78/x
  3. Step 3: Cross multiply
    87.83x = 131.84 × 51.78
  4. Step 4: Simplify right side
    87.83x = 6,826.68
  5. Step 5: Solve for x
    x = 6,826.68/87.83
  6. Step 6: Final answer
    x = 77.73

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