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Finding the Fourth Proportional to 85.53, 128.22 and 65.19

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Solution

The fourth proportional to 85.53, 128.22 and 65.19 is: 97.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.53 : 128.22 = 65.19 : x
  2. Step 2: Convert to fraction form
    85.53/128.22 = 65.19/x
  3. Step 3: Cross multiply
    85.53x = 128.22 × 65.19
  4. Step 4: Simplify right side
    85.53x = 8,358.66
  5. Step 5: Solve for x
    x = 8,358.66/85.53
  6. Step 6: Final answer
    x = 97.73

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