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Finding the Fourth Proportional to 412,685.78, 619,117.79 and 128,370.92

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Solution

The fourth proportional to 412,685.78, 619,117.79 and 128,370.92 is: 192,584.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    412,685.78 : 619,117.79 = 128,370.92 : x
  2. Step 2: Convert to fraction form
    412,685.78/619,117.79 = 128,370.92/x
  3. Step 3: Cross multiply
    412,685.78x = 619,117.79 × 128,370.92
  4. Step 4: Simplify right side
    412,685.78x = 79,476,716,553.22
  5. Step 5: Solve for x
    x = 79,476,716,553.22/412,685.78
  6. Step 6: Final answer
    x = 192,584.10

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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.