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Finding the Fourth Proportional to 128,481.53, 192,721.22 and 100,425.19

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Solution

The fourth proportional to 128,481.53, 192,721.22 and 100,425.19 is: 150,636.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,481.53 : 192,721.22 = 100,425.19 : x
  2. Step 2: Convert to fraction form
    128,481.53/192,721.22 = 100,425.19/x
  3. Step 3: Cross multiply
    128,481.53x = 192,721.22 × 100,425.19
  4. Step 4: Simplify right side
    128,481.53x = 19,354,063,669.80
  5. Step 5: Solve for x
    x = 19,354,063,669.80/128,481.53
  6. Step 6: Final answer
    x = 150,636.93

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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.