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Finding the Fourth Proportional to 643,814.10, 965,337.15 and 394,674.90

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Solution

The fourth proportional to 643,814.10, 965,337.15 and 394,674.90 is: 591,776.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,814.10 : 965,337.15 = 394,674.90 : x
  2. Step 2: Convert to fraction form
    643,814.10/965,337.15 = 394,674.90/x
  3. Step 3: Cross multiply
    643,814.10x = 965,337.15 × 394,674.90
  4. Step 4: Simplify right side
    643,814.10x = 380,994,343,142.54
  5. Step 5: Solve for x
    x = 380,994,343,142.54/643,814.10
  6. Step 6: Final answer
    x = 591,776.95

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Double scale
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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.