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Finding the Fourth Proportional to 91.28, 136.71 and 55.13

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Solution

The fourth proportional to 91.28, 136.71 and 55.13 is: 82.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.28 : 136.71 = 55.13 : x
  2. Step 2: Convert to fraction form
    91.28/136.71 = 55.13/x
  3. Step 3: Cross multiply
    91.28x = 136.71 × 55.13
  4. Step 4: Simplify right side
    91.28x = 7,536.82
  5. Step 5: Solve for x
    x = 7,536.82/91.28
  6. Step 6: Final answer
    x = 82.57

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