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Finding the Fourth Proportional to 144.23, 216.09 and 90

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Solution

The fourth proportional to 144.23, 216.09 and 90 is: 134.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.23 : 216.09 = 90 : x
  2. Step 2: Convert to fraction form
    144.23/216.09 = 90/x
  3. Step 3: Cross multiply
    144.23x = 216.09 × 90
  4. Step 4: Simplify right side
    144.23x = 19,448.10
  5. Step 5: Solve for x
    x = 19,448.10/144.23
  6. Step 6: Final answer
    x = 134.85

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