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Finding the Fourth Proportional to 66,198.71, 91,375.11 and 42,325.48

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Solution

The fourth proportional to 66,198.71, 91,375.11 and 42,325.48 is: 58,422.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,198.71 : 91,375.11 = 42,325.48 : x
  2. Step 2: Convert to fraction form
    66,198.71/91,375.11 = 42,325.48/x
  3. Step 3: Cross multiply
    66,198.71x = 91,375.11 × 42,325.48
  4. Step 4: Simplify right side
    66,198.71x = 3,867,494,722.30
  5. Step 5: Solve for x
    x = 3,867,494,722.30/66,198.71
  6. Step 6: Final answer
    x = 58,422.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.