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Finding the Fourth Proportional to 643,800.70, 965,701.05 and 404,299.90

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Solution

The fourth proportional to 643,800.70, 965,701.05 and 404,299.90 is: 606,449.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,800.70 : 965,701.05 = 404,299.90 : x
  2. Step 2: Convert to fraction form
    643,800.70/965,701.05 = 404,299.90/x
  3. Step 3: Cross multiply
    643,800.70x = 965,701.05 × 404,299.90
  4. Step 4: Simplify right side
    643,800.70x = 390,432,837,944.90
  5. Step 5: Solve for x
    x = 390,432,837,944.90/643,800.70
  6. Step 6: Final answer
    x = 606,449.85

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Similar ratio
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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.