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Finding the Fourth Proportional to 128,928.60, 193,392.90 and 89,562.60

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Solution

The fourth proportional to 128,928.60, 193,392.90 and 89,562.60 is: 134,343.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,928.60 : 193,392.90 = 89,562.60 : x
  2. Step 2: Convert to fraction form
    128,928.60/193,392.90 = 89,562.60/x
  3. Step 3: Cross multiply
    128,928.60x = 193,392.90 × 89,562.60
  4. Step 4: Simplify right side
    128,928.60x = 17,320,770,945.54
  5. Step 5: Solve for x
    x = 17,320,770,945.54/128,928.60
  6. Step 6: Final answer
    x = 134,343.90

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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.