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Finding the Fourth Proportional to 398.51, 550.02 and 288.50

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Solution

The fourth proportional to 398.51, 550.02 and 288.50 is: 398.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.51 : 550.02 = 288.50 : x
  2. Step 2: Convert to fraction form
    398.51/550.02 = 288.50/x
  3. Step 3: Cross multiply
    398.51x = 550.02 × 288.50
  4. Step 4: Simplify right side
    398.51x = 158,680.77
  5. Step 5: Solve for x
    x = 158,680.77/398.51
  6. Step 6: Final answer
    x = 398.19

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