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Finding the Fourth Proportional to 90.56, 135.84 and 54.71

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Solution

The fourth proportional to 90.56, 135.84 and 54.71 is: 82.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.56 : 135.84 = 54.71 : x
  2. Step 2: Convert to fraction form
    90.56/135.84 = 54.71/x
  3. Step 3: Cross multiply
    90.56x = 135.84 × 54.71
  4. Step 4: Simplify right side
    90.56x = 7,432.61
  5. Step 5: Solve for x
    x = 7,432.61/90.56
  6. Step 6: Final answer
    x = 82.08

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