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Finding the Fourth Proportional to 74,328.60, 111,168.90 and 66,487.80

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Solution

The fourth proportional to 74,328.60, 111,168.90 and 66,487.80 is: 99,441.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,328.60 : 111,168.90 = 66,487.80 : x
  2. Step 2: Convert to fraction form
    74,328.60/111,168.90 = 66,487.80/x
  3. Step 3: Cross multiply
    74,328.60x = 111,168.90 × 66,487.80
  4. Step 4: Simplify right side
    74,328.60x = 7,391,375,589.42
  5. Step 5: Solve for x
    x = 7,391,375,589.42/74,328.60
  6. Step 6: Final answer
    x = 99,441.88

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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.