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Finding the Fourth Proportional to 128,839.20, 193,777.20 and 115,360.80

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Solution

The fourth proportional to 128,839.20, 193,777.20 and 115,360.80 is: 173,505.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,839.20 : 193,777.20 = 115,360.80 : x
  2. Step 2: Convert to fraction form
    128,839.20/193,777.20 = 115,360.80/x
  3. Step 3: Cross multiply
    128,839.20x = 193,777.20 × 115,360.80
  4. Step 4: Simplify right side
    128,839.20x = 22,354,292,813.76
  5. Step 5: Solve for x
    x = 22,354,292,813.76/128,839.20
  6. Step 6: Final answer
    x = 173,505.37

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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.