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Finding the Fourth Proportional to 90.73, 135.98 and 54.19

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Solution

The fourth proportional to 90.73, 135.98 and 54.19 is: 81.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.73 : 135.98 = 54.19 : x
  2. Step 2: Convert to fraction form
    90.73/135.98 = 54.19/x
  3. Step 3: Cross multiply
    90.73x = 135.98 × 54.19
  4. Step 4: Simplify right side
    90.73x = 7,368.64
  5. Step 5: Solve for x
    x = 7,368.64/90.73
  6. Step 6: Final answer
    x = 81.22

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