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Finding the Fourth Proportional to 719.73, 1,078.65 and 329.78

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Solution

The fourth proportional to 719.73, 1,078.65 and 329.78 is: 494.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.73 : 1,078.65 = 329.78 : x
  2. Step 2: Convert to fraction form
    719.73/1,078.65 = 329.78/x
  3. Step 3: Cross multiply
    719.73x = 1,078.65 × 329.78
  4. Step 4: Simplify right side
    719.73x = 355,719.89
  5. Step 5: Solve for x
    x = 355,719.89/719.73
  6. Step 6: Final answer
    x = 494.24

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