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Finding the Fourth Proportional to 8,115, 11,198.70 and 4,389

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Solution

The fourth proportional to 8,115, 11,198.70 and 4,389 is: 6,056.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,115 : 11,198.70 = 4,389 : x
  2. Step 2: Convert to fraction form
    8,115/11,198.70 = 4,389/x
  3. Step 3: Cross multiply
    8,115x = 11,198.70 × 4,389
  4. Step 4: Simplify right side
    8,115x = 49,151,094.30
  5. Step 5: Solve for x
    x = 49,151,094.30/8,115
  6. Step 6: Final answer
    x = 6,056.82

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