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Finding the Fourth Proportional to 355, 489.94 and 207.60

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Solution

The fourth proportional to 355, 489.94 and 207.60 is: 286.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    355 : 489.94 = 207.60 : x
  2. Step 2: Convert to fraction form
    355/489.94 = 207.60/x
  3. Step 3: Cross multiply
    355x = 489.94 × 207.60
  4. Step 4: Simplify right side
    355x = 101,711.54
  5. Step 5: Solve for x
    x = 101,711.54/355
  6. Step 6: Final answer
    x = 286.51

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