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Finding the Fourth Proportional to 643,806.20, 965,709.30 and 404,305.40

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Solution

The fourth proportional to 643,806.20, 965,709.30 and 404,305.40 is: 606,458.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,806.20 : 965,709.30 = 404,305.40 : x
  2. Step 2: Convert to fraction form
    643,806.20/965,709.30 = 404,305.40/x
  3. Step 3: Cross multiply
    643,806.20x = 965,709.30 × 404,305.40
  4. Step 4: Simplify right side
    643,806.20x = 390,441,484,820.22
  5. Step 5: Solve for x
    x = 390,441,484,820.22/643,806.20
  6. Step 6: Final answer
    x = 606,458.10

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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.