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Finding the Fourth Proportional to 74,372.60, 111,234.90 and 66,531.80

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Solution

The fourth proportional to 74,372.60, 111,234.90 and 66,531.80 is: 99,507.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,372.60 : 111,234.90 = 66,531.80 : x
  2. Step 2: Convert to fraction form
    74,372.60/111,234.90 = 66,531.80/x
  3. Step 3: Cross multiply
    74,372.60x = 111,234.90 × 66,531.80
  4. Step 4: Simplify right side
    74,372.60x = 7,400,658,119.82
  5. Step 5: Solve for x
    x = 7,400,658,119.82/74,372.60
  6. Step 6: Final answer
    x = 99,507.86

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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.