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Finding the Fourth Proportional to 664,640.90, 996,961.35 and 221,408.90

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Solution

The fourth proportional to 664,640.90, 996,961.35 and 221,408.90 is: 332,113.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,640.90 : 996,961.35 = 221,408.90 : x
  2. Step 2: Convert to fraction form
    664,640.90/996,961.35 = 221,408.90/x
  3. Step 3: Cross multiply
    664,640.90x = 996,961.35 × 221,408.90
  4. Step 4: Simplify right side
    664,640.90x = 220,736,115,846.02
  5. Step 5: Solve for x
    x = 220,736,115,846.02/664,640.90
  6. Step 6: Final answer
    x = 332,113.35

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