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Finding the Fourth Proportional to 253.28, 379.89 and 90.95

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Solution

The fourth proportional to 253.28, 379.89 and 90.95 is: 136.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.28 : 379.89 = 90.95 : x
  2. Step 2: Convert to fraction form
    253.28/379.89 = 90.95/x
  3. Step 3: Cross multiply
    253.28x = 379.89 × 90.95
  4. Step 4: Simplify right side
    253.28x = 34,549.10
  5. Step 5: Solve for x
    x = 34,549.10/253.28
  6. Step 6: Final answer
    x = 136.41

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