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Finding the Fourth Proportional to 399.39, 599.21 and 155.99

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Solution

The fourth proportional to 399.39, 599.21 and 155.99 is: 234.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.39 : 599.21 = 155.99 : x
  2. Step 2: Convert to fraction form
    399.39/599.21 = 155.99/x
  3. Step 3: Cross multiply
    399.39x = 599.21 × 155.99
  4. Step 4: Simplify right side
    399.39x = 93,466.99
  5. Step 5: Solve for x
    x = 93,466.99/399.39
  6. Step 6: Final answer
    x = 234.02

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