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Finding the Fourth Proportional to 8,636.39, 12,945.95 and 3,639.98

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Solution

The fourth proportional to 8,636.39, 12,945.95 and 3,639.98 is: 5,456.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,636.39 : 12,945.95 = 3,639.98 : x
  2. Step 2: Convert to fraction form
    8,636.39/12,945.95 = 3,639.98/x
  3. Step 3: Cross multiply
    8,636.39x = 12,945.95 × 3,639.98
  4. Step 4: Simplify right side
    8,636.39x = 47,122,916.15
  5. Step 5: Solve for x
    x = 47,122,916.15/8,636.39
  6. Step 6: Final answer
    x = 5,456.32

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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.