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Finding the Fourth Proportional to 127,891.20, 192,009.60 and 81,235.20

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Solution

The fourth proportional to 127,891.20, 192,009.60 and 81,235.20 is: 121,962.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,891.20 : 192,009.60 = 81,235.20 : x
  2. Step 2: Convert to fraction form
    127,891.20/192,009.60 = 81,235.20/x
  3. Step 3: Cross multiply
    127,891.20x = 192,009.60 × 81,235.20
  4. Step 4: Simplify right side
    127,891.20x = 15,597,938,257.92
  5. Step 5: Solve for x
    x = 15,597,938,257.92/127,891.20
  6. Step 6: Final answer
    x = 121,962.56

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1.5x scale

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.