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Finding the Fourth Proportional to 20,636.76, 30,936.78 and 8,943.60

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Solution

The fourth proportional to 20,636.76, 30,936.78 and 8,943.60 is: 13,407.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,636.76 : 30,936.78 = 8,943.60 : x
  2. Step 2: Convert to fraction form
    20,636.76/30,936.78 = 8,943.60/x
  3. Step 3: Cross multiply
    20,636.76x = 30,936.78 × 8,943.60
  4. Step 4: Simplify right side
    20,636.76x = 276,686,185.61
  5. Step 5: Solve for x
    x = 276,686,185.61/20,636.76
  6. Step 6: Final answer
    x = 13,407.44

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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.