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Finding the Fourth Proportional to 468.58, 647.34 and 399.35

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Solution

The fourth proportional to 468.58, 647.34 and 399.35 is: 551.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.58 : 647.34 = 399.35 : x
  2. Step 2: Convert to fraction form
    468.58/647.34 = 399.35/x
  3. Step 3: Cross multiply
    468.58x = 647.34 × 399.35
  4. Step 4: Simplify right side
    468.58x = 258,511.99
  5. Step 5: Solve for x
    x = 258,511.99/468.58
  6. Step 6: Final answer
    x = 551.70

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