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Finding the Fourth Proportional to 708.69, 978.00 and 393.96

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Solution

The fourth proportional to 708.69, 978.00 and 393.96 is: 543.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.69 : 978.00 = 393.96 : x
  2. Step 2: Convert to fraction form
    708.69/978.00 = 393.96/x
  3. Step 3: Cross multiply
    708.69x = 978.00 × 393.96
  4. Step 4: Simplify right side
    708.69x = 385,286.02
  5. Step 5: Solve for x
    x = 385,286.02/708.69
  6. Step 6: Final answer
    x = 543.66

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