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Finding the Fourth Proportional to 90,423.20, 135,634.80 and 80,400.80

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Solution

The fourth proportional to 90,423.20, 135,634.80 and 80,400.80 is: 120,601.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,423.20 : 135,634.80 = 80,400.80 : x
  2. Step 2: Convert to fraction form
    90,423.20/135,634.80 = 80,400.80/x
  3. Step 3: Cross multiply
    90,423.20x = 135,634.80 × 80,400.80
  4. Step 4: Simplify right side
    90,423.20x = 10,905,146,427.84
  5. Step 5: Solve for x
    x = 10,905,146,427.84/90,423.20
  6. Step 6: Final answer
    x = 120,601.20

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