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Finding the Fourth Proportional to 127,911.20, 192,039.60 and 81,255.20

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Solution

The fourth proportional to 127,911.20, 192,039.60 and 81,255.20 is: 121,992.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,911.20 : 192,039.60 = 81,255.20 : x
  2. Step 2: Convert to fraction form
    127,911.20/192,039.60 = 81,255.20/x
  3. Step 3: Cross multiply
    127,911.20x = 192,039.60 × 81,255.20
  4. Step 4: Simplify right side
    127,911.20x = 15,604,216,105.92
  5. Step 5: Solve for x
    x = 15,604,216,105.92/127,911.20
  6. Step 6: Final answer
    x = 121,992.57

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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.