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Finding the Fourth Proportional to 664,815.40, 996,639.90 and 398,681.80

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Solution

The fourth proportional to 664,815.40, 996,639.90 and 398,681.80 is: 597,672.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,815.40 : 996,639.90 = 398,681.80 : x
  2. Step 2: Convert to fraction form
    664,815.40/996,639.90 = 398,681.80/x
  3. Step 3: Cross multiply
    664,815.40x = 996,639.90 × 398,681.80
  4. Step 4: Simplify right side
    664,815.40x = 397,342,189,283.82
  5. Step 5: Solve for x
    x = 397,342,189,283.82/664,815.40
  6. Step 6: Final answer
    x = 597,672.96

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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.