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Finding the Fourth Proportional to 8,639.61, 12,959.43 and 2,399.96

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Solution

The fourth proportional to 8,639.61, 12,959.43 and 2,399.96 is: 3,599.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.61 : 12,959.43 = 2,399.96 : x
  2. Step 2: Convert to fraction form
    8,639.61/12,959.43 = 2,399.96/x
  3. Step 3: Cross multiply
    8,639.61x = 12,959.43 × 2,399.96
  4. Step 4: Simplify right side
    8,639.61x = 31,102,048.83
  5. Step 5: Solve for x
    x = 31,102,048.83/8,639.61
  6. Step 6: Final answer
    x = 3,599.94

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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.