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Finding the Fourth Proportional to 66,921.72, 100,388.04 and 33,624.60

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Solution

The fourth proportional to 66,921.72, 100,388.04 and 33,624.60 is: 50,439.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,921.72 : 100,388.04 = 33,624.60 : x
  2. Step 2: Convert to fraction form
    66,921.72/100,388.04 = 33,624.60/x
  3. Step 3: Cross multiply
    66,921.72x = 100,388.04 × 33,624.60
  4. Step 4: Simplify right side
    66,921.72x = 3,375,507,689.78
  5. Step 5: Solve for x
    x = 3,375,507,689.78/66,921.72
  6. Step 6: Final answer
    x = 50,439.64

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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.