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Finding the Fourth Proportional to 399.03, 549.86 and 258.99

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Solution

The fourth proportional to 399.03, 549.86 and 258.99 is: 356.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.03 : 549.86 = 258.99 : x
  2. Step 2: Convert to fraction form
    399.03/549.86 = 258.99/x
  3. Step 3: Cross multiply
    399.03x = 549.86 × 258.99
  4. Step 4: Simplify right side
    399.03x = 142,406.95
  5. Step 5: Solve for x
    x = 142,406.95/399.03
  6. Step 6: Final answer
    x = 356.88

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