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Finding the Fourth Proportional to 85.61, 128.39 and 27.83

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Solution

The fourth proportional to 85.61, 128.39 and 27.83 is: 41.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.61 : 128.39 = 27.83 : x
  2. Step 2: Convert to fraction form
    85.61/128.39 = 27.83/x
  3. Step 3: Cross multiply
    85.61x = 128.39 × 27.83
  4. Step 4: Simplify right side
    85.61x = 3,573.09
  5. Step 5: Solve for x
    x = 3,573.09/85.61
  6. Step 6: Final answer
    x = 41.74

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