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Finding the Fourth Proportional to 128.67, 193.13 and 77.43

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Solution

The fourth proportional to 128.67, 193.13 and 77.43 is: 116.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.67 : 193.13 = 77.43 : x
  2. Step 2: Convert to fraction form
    128.67/193.13 = 77.43/x
  3. Step 3: Cross multiply
    128.67x = 193.13 × 77.43
  4. Step 4: Simplify right side
    128.67x = 14,954.06
  5. Step 5: Solve for x
    x = 14,954.06/128.67
  6. Step 6: Final answer
    x = 116.22

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