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Finding the Fourth Proportional to 8,572.38, 12,856.34 and 3,639.48

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Solution

The fourth proportional to 8,572.38, 12,856.34 and 3,639.48 is: 5,458.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,572.38 : 12,856.34 = 3,639.48 : x
  2. Step 2: Convert to fraction form
    8,572.38/12,856.34 = 3,639.48/x
  3. Step 3: Cross multiply
    8,572.38x = 12,856.34 × 3,639.48
  4. Step 4: Simplify right side
    8,572.38x = 46,790,392.30
  5. Step 5: Solve for x
    x = 46,790,392.30/8,572.38
  6. Step 6: Final answer
    x = 5,458.27

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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.