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Finding the Fourth Proportional to 138.65, 208.00 and 57.44

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Solution

The fourth proportional to 138.65, 208.00 and 57.44 is: 86.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.65 : 208.00 = 57.44 : x
  2. Step 2: Convert to fraction form
    138.65/208.00 = 57.44/x
  3. Step 3: Cross multiply
    138.65x = 208.00 × 57.44
  4. Step 4: Simplify right side
    138.65x = 11,948.11
  5. Step 5: Solve for x
    x = 11,948.11/138.65
  6. Step 6: Final answer
    x = 86.18

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