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Finding the Fourth Proportional to 128,832.40, 193,344.60 and 66,470.80

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Solution

The fourth proportional to 128,832.40, 193,344.60 and 66,470.80 is: 99,755.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,832.40 : 193,344.60 = 66,470.80 : x
  2. Step 2: Convert to fraction form
    128,832.40/193,344.60 = 66,470.80/x
  3. Step 3: Cross multiply
    128,832.40x = 193,344.60 × 66,470.80
  4. Step 4: Simplify right side
    128,832.40x = 12,851,770,237.68
  5. Step 5: Solve for x
    x = 12,851,770,237.68/128,832.40
  6. Step 6: Final answer
    x = 99,755.73

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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.