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Finding the Fourth Proportional to 128,818.40, 193,323.60 and 66,456.80

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Solution

The fourth proportional to 128,818.40, 193,323.60 and 66,456.80 is: 99,734.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,818.40 : 193,323.60 = 66,456.80 : x
  2. Step 2: Convert to fraction form
    128,818.40/193,323.60 = 66,456.80/x
  3. Step 3: Cross multiply
    128,818.40x = 193,323.60 × 66,456.80
  4. Step 4: Simplify right side
    128,818.40x = 12,847,667,820.48
  5. Step 5: Solve for x
    x = 12,847,667,820.48/128,818.40
  6. Step 6: Final answer
    x = 99,734.73

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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.