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Finding the Fourth Proportional to 505.11, 757.65 and 139.92

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Solution

The fourth proportional to 505.11, 757.65 and 139.92 is: 209.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.11 : 757.65 = 139.92 : x
  2. Step 2: Convert to fraction form
    505.11/757.65 = 139.92/x
  3. Step 3: Cross multiply
    505.11x = 757.65 × 139.92
  4. Step 4: Simplify right side
    505.11x = 106,010.39
  5. Step 5: Solve for x
    x = 106,010.39/505.11
  6. Step 6: Final answer
    x = 209.88

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