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Finding the Fourth Proportional to 135.93, 203.45 and 81.57

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Solution

The fourth proportional to 135.93, 203.45 and 81.57 is: 122.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.93 : 203.45 = 81.57 : x
  2. Step 2: Convert to fraction form
    135.93/203.45 = 81.57/x
  3. Step 3: Cross multiply
    135.93x = 203.45 × 81.57
  4. Step 4: Simplify right side
    135.93x = 16,595.01
  5. Step 5: Solve for x
    x = 16,595.01/135.93
  6. Step 6: Final answer
    x = 122.08

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