Home / 8,639.68-12,951.60-3,091.72

Finding the Fourth Proportional to 8,639.68, 12,951.60 and 3,091.72

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Solution

The fourth proportional to 8,639.68, 12,951.60 and 3,091.72 is: 4,634.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.68 : 12,951.60 = 3,091.72 : x
  2. Step 2: Convert to fraction form
    8,639.68/12,951.60 = 3,091.72/x
  3. Step 3: Cross multiply
    8,639.68x = 12,951.60 × 3,091.72
  4. Step 4: Simplify right side
    8,639.68x = 40,042,720.75
  5. Step 5: Solve for x
    x = 40,042,720.75/8,639.68
  6. Step 6: Final answer
    x = 4,634.75

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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.