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Finding the Fourth Proportional to 128,892.80, 193,339.20 and 82,236.80

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Solution

The fourth proportional to 128,892.80, 193,339.20 and 82,236.80 is: 123,355.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,892.80 : 193,339.20 = 82,236.80 : x
  2. Step 2: Convert to fraction form
    128,892.80/193,339.20 = 82,236.80/x
  3. Step 3: Cross multiply
    128,892.80x = 193,339.20 × 82,236.80
  4. Step 4: Simplify right side
    128,892.80x = 15,899,597,122.56
  5. Step 5: Solve for x
    x = 15,899,597,122.56/128,892.80
  6. Step 6: Final answer
    x = 123,355.20

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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.