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Finding the Fourth Proportional to 394,401.71, 545,193.78 and 351,803.38

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Solution

The fourth proportional to 394,401.71, 545,193.78 and 351,803.38 is: 486,308.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,401.71 : 545,193.78 = 351,803.38 : x
  2. Step 2: Convert to fraction form
    394,401.71/545,193.78 = 351,803.38/x
  3. Step 3: Cross multiply
    394,401.71x = 545,193.78 × 351,803.38
  4. Step 4: Simplify right side
    394,401.71x = 191,801,014,558.98
  5. Step 5: Solve for x
    x = 191,801,014,558.98/394,401.71
  6. Step 6: Final answer
    x = 486,308.78

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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.