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Finding the Fourth Proportional to 138.29, 190.94 and 89.19

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Solution

The fourth proportional to 138.29, 190.94 and 89.19 is: 123.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.29 : 190.94 = 89.19 : x
  2. Step 2: Convert to fraction form
    138.29/190.94 = 89.19/x
  3. Step 3: Cross multiply
    138.29x = 190.94 × 89.19
  4. Step 4: Simplify right side
    138.29x = 17,029.49
  5. Step 5: Solve for x
    x = 17,029.49/138.29
  6. Step 6: Final answer
    x = 123.15

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