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Finding the Fourth Proportional to 399.80, 599.60 and 143.30

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Solution

The fourth proportional to 399.80, 599.60 and 143.30 is: 214.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.80 : 599.60 = 143.30 : x
  2. Step 2: Convert to fraction form
    399.80/599.60 = 143.30/x
  3. Step 3: Cross multiply
    399.80x = 599.60 × 143.30
  4. Step 4: Simplify right side
    399.80x = 85,920.04
  5. Step 5: Solve for x
    x = 85,920.04/399.80
  6. Step 6: Final answer
    x = 214.91

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