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Finding the Fourth Proportional to 126,911.20, 190,366.80 and 87,512.80

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Solution

The fourth proportional to 126,911.20, 190,366.80 and 87,512.80 is: 131,269.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,911.20 : 190,366.80 = 87,512.80 : x
  2. Step 2: Convert to fraction form
    126,911.20/190,366.80 = 87,512.80/x
  3. Step 3: Cross multiply
    126,911.20x = 190,366.80 × 87,512.80
  4. Step 4: Simplify right side
    126,911.20x = 16,659,531,695.04
  5. Step 5: Solve for x
    x = 16,659,531,695.04/126,911.20
  6. Step 6: Final answer
    x = 131,269.20

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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.