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Finding the Fourth Proportional to 398,739.15, 550,259.69 and 217,451.43

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Solution

The fourth proportional to 398,739.15, 550,259.69 and 217,451.43 is: 300,082.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,739.15 : 550,259.69 = 217,451.43 : x
  2. Step 2: Convert to fraction form
    398,739.15/550,259.69 = 217,451.43/x
  3. Step 3: Cross multiply
    398,739.15x = 550,259.69 × 217,451.43
  4. Step 4: Simplify right side
    398,739.15x = 119,654,755,374.60
  5. Step 5: Solve for x
    x = 119,654,755,374.60/398,739.15
  6. Step 6: Final answer
    x = 300,082.79

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