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Finding the Fourth Proportional to 643,800.20, 965,700.30 and 404,299.40

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Solution

The fourth proportional to 643,800.20, 965,700.30 and 404,299.40 is: 606,449.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,800.20 : 965,700.30 = 404,299.40 : x
  2. Step 2: Convert to fraction form
    643,800.20/965,700.30 = 404,299.40/x
  3. Step 3: Cross multiply
    643,800.20x = 965,700.30 × 404,299.40
  4. Step 4: Simplify right side
    643,800.20x = 390,432,051,869.82
  5. Step 5: Solve for x
    x = 390,432,051,869.82/643,800.20
  6. Step 6: Final answer
    x = 606,449.10

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Double scale
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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.