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Finding the Fourth Proportional to 656,685.39, 906,186.78 and 381,021.96

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Solution

The fourth proportional to 656,685.39, 906,186.78 and 381,021.96 is: 525,787.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,685.39 : 906,186.78 = 381,021.96 : x
  2. Step 2: Convert to fraction form
    656,685.39/906,186.78 = 381,021.96/x
  3. Step 3: Cross multiply
    656,685.39x = 906,186.78 × 381,021.96
  4. Step 4: Simplify right side
    656,685.39x = 345,277,063,041.69
  5. Step 5: Solve for x
    x = 345,277,063,041.69/656,685.39
  6. Step 6: Final answer
    x = 525,787.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.