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Finding the Fourth Proportional to 643,959.20, 965,938.80 and 404,458.40

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Solution

The fourth proportional to 643,959.20, 965,938.80 and 404,458.40 is: 606,687.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,959.20 : 965,938.80 = 404,458.40 : x
  2. Step 2: Convert to fraction form
    643,959.20/965,938.80 = 404,458.40/x
  3. Step 3: Cross multiply
    643,959.20x = 965,938.80 × 404,458.40
  4. Step 4: Simplify right side
    643,959.20x = 390,682,061,545.92
  5. Step 5: Solve for x
    x = 390,682,061,545.92/643,959.20
  6. Step 6: Final answer
    x = 606,687.60

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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.