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Finding the Fourth Proportional to 12,639.15, 18,963.11 and 5,619.79

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Solution

The fourth proportional to 12,639.15, 18,963.11 and 5,619.79 is: 8,431.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.15 : 18,963.11 = 5,619.79 : x
  2. Step 2: Convert to fraction form
    12,639.15/18,963.11 = 5,619.79/x
  3. Step 3: Cross multiply
    12,639.15x = 18,963.11 × 5,619.79
  4. Step 4: Simplify right side
    12,639.15x = 106,568,760.37
  5. Step 5: Solve for x
    x = 106,568,760.37/12,639.15
  6. Step 6: Final answer
    x = 8,431.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.