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Finding the Fourth Proportional to 398.87, 598.56 and 142.37

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Solution

The fourth proportional to 398.87, 598.56 and 142.37 is: 213.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.87 : 598.56 = 142.37 : x
  2. Step 2: Convert to fraction form
    398.87/598.56 = 142.37/x
  3. Step 3: Cross multiply
    398.87x = 598.56 × 142.37
  4. Step 4: Simplify right side
    398.87x = 85,213.46
  5. Step 5: Solve for x
    x = 85,213.46/398.87
  6. Step 6: Final answer
    x = 213.64

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