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Finding the Fourth Proportional to 390,930.75, 539,480.79 and 221,164.88

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Solution

The fourth proportional to 390,930.75, 539,480.79 and 221,164.88 is: 305,205.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,930.75 : 539,480.79 = 221,164.88 : x
  2. Step 2: Convert to fraction form
    390,930.75/539,480.79 = 221,164.88/x
  3. Step 3: Cross multiply
    390,930.75x = 539,480.79 × 221,164.88
  4. Step 4: Simplify right side
    390,930.75x = 119,314,201,485.25
  5. Step 5: Solve for x
    x = 119,314,201,485.25/390,930.75
  6. Step 6: Final answer
    x = 305,205.47

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