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Finding the Fourth Proportional to 128,851.20, 193,795.20 and 115,372.80

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Solution

The fourth proportional to 128,851.20, 193,795.20 and 115,372.80 is: 173,523.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,851.20 : 193,795.20 = 115,372.80 : x
  2. Step 2: Convert to fraction form
    128,851.20/193,795.20 = 115,372.80/x
  3. Step 3: Cross multiply
    128,851.20x = 193,795.20 × 115,372.80
  4. Step 4: Simplify right side
    128,851.20x = 22,358,694,850.56
  5. Step 5: Solve for x
    x = 22,358,694,850.56/128,851.20
  6. Step 6: Final answer
    x = 173,523.37

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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.