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Finding the Fourth Proportional to 710.47, 980.27 and 399.97

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Solution

The fourth proportional to 710.47, 980.27 and 399.97 is: 551.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.47 : 980.27 = 399.97 : x
  2. Step 2: Convert to fraction form
    710.47/980.27 = 399.97/x
  3. Step 3: Cross multiply
    710.47x = 980.27 × 399.97
  4. Step 4: Simplify right side
    710.47x = 392,073.69
  5. Step 5: Solve for x
    x = 392,073.69/710.47
  6. Step 6: Final answer
    x = 551.86

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