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Finding the Fourth Proportional to 85.71, 128.59 and 24.85

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Solution

The fourth proportional to 85.71, 128.59 and 24.85 is: 37.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.71 : 128.59 = 24.85 : x
  2. Step 2: Convert to fraction form
    85.71/128.59 = 24.85/x
  3. Step 3: Cross multiply
    85.71x = 128.59 × 24.85
  4. Step 4: Simplify right side
    85.71x = 3,195.52
  5. Step 5: Solve for x
    x = 3,195.52/85.71
  6. Step 6: Final answer
    x = 37.28

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