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Finding the Fourth Proportional to 131,891.20, 197,836.80 and 81,152.80

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Solution

The fourth proportional to 131,891.20, 197,836.80 and 81,152.80 is: 121,729.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,891.20 : 197,836.80 = 81,152.80 : x
  2. Step 2: Convert to fraction form
    131,891.20/197,836.80 = 81,152.80/x
  3. Step 3: Cross multiply
    131,891.20x = 197,836.80 × 81,152.80
  4. Step 4: Simplify right side
    131,891.20x = 16,055,010,263.04
  5. Step 5: Solve for x
    x = 16,055,010,263.04/131,891.20
  6. Step 6: Final answer
    x = 121,729.20

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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.