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Finding the Fourth Proportional to 90.12, 135.36 and 73.92

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Solution

The fourth proportional to 90.12, 135.36 and 73.92 is: 111.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.12 : 135.36 = 73.92 : x
  2. Step 2: Convert to fraction form
    90.12/135.36 = 73.92/x
  3. Step 3: Cross multiply
    90.12x = 135.36 × 73.92
  4. Step 4: Simplify right side
    90.12x = 10,005.81
  5. Step 5: Solve for x
    x = 10,005.81/90.12
  6. Step 6: Final answer
    x = 111.03

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