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Finding the Fourth Proportional to 665,763.60, 998,896.80 and 399,709.56

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Solution

The fourth proportional to 665,763.60, 998,896.80 and 399,709.56 is: 599,715.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,763.60 : 998,896.80 = 399,709.56 : x
  2. Step 2: Convert to fraction form
    665,763.60/998,896.80 = 399,709.56/x
  3. Step 3: Cross multiply
    665,763.60x = 998,896.80 × 399,709.56
  4. Step 4: Simplify right side
    665,763.60x = 399,268,600,413.41
  5. Step 5: Solve for x
    x = 399,268,600,413.41/665,763.60
  6. Step 6: Final answer
    x = 599,715.27

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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.