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Finding the Fourth Proportional to 94.76, 142.16 and 85.80

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Solution

The fourth proportional to 94.76, 142.16 and 85.80 is: 128.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.76 : 142.16 = 85.80 : x
  2. Step 2: Convert to fraction form
    94.76/142.16 = 85.80/x
  3. Step 3: Cross multiply
    94.76x = 142.16 × 85.80
  4. Step 4: Simplify right side
    94.76x = 12,197.33
  5. Step 5: Solve for x
    x = 12,197.33/94.76
  6. Step 6: Final answer
    x = 128.72

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