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Finding the Fourth Proportional to 66,921.52, 100,397.13 and 20,171.02

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Solution

The fourth proportional to 66,921.52, 100,397.13 and 20,171.02 is: 30,261.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,921.52 : 100,397.13 = 20,171.02 : x
  2. Step 2: Convert to fraction form
    66,921.52/100,397.13 = 20,171.02/x
  3. Step 3: Cross multiply
    66,921.52x = 100,397.13 × 20,171.02
  4. Step 4: Simplify right side
    66,921.52x = 2,025,112,517.17
  5. Step 5: Solve for x
    x = 2,025,112,517.17/66,921.52
  6. Step 6: Final answer
    x = 30,261.01

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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.