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Finding the Fourth Proportional to 66,936.33, 100,405.22 and 20,189.61

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Solution

The fourth proportional to 66,936.33, 100,405.22 and 20,189.61 is: 30,284.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,936.33 : 100,405.22 = 20,189.61 : x
  2. Step 2: Convert to fraction form
    66,936.33/100,405.22 = 20,189.61/x
  3. Step 3: Cross multiply
    66,936.33x = 100,405.22 × 20,189.61
  4. Step 4: Simplify right side
    66,936.33x = 2,027,142,132.82
  5. Step 5: Solve for x
    x = 2,027,142,132.82/66,936.33
  6. Step 6: Final answer
    x = 30,284.63

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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.