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Finding the Fourth Proportional to 262,893.60, 394,243.20 and 85,406.40

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Solution

The fourth proportional to 262,893.60, 394,243.20 and 85,406.40 is: 128,078.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    262,893.60 : 394,243.20 = 85,406.40 : x
  2. Step 2: Convert to fraction form
    262,893.60/394,243.20 = 85,406.40/x
  3. Step 3: Cross multiply
    262,893.60x = 394,243.20 × 85,406.40
  4. Step 4: Simplify right side
    262,893.60x = 33,670,892,436.48
  5. Step 5: Solve for x
    x = 33,670,892,436.48/262,893.60
  6. Step 6: Final answer
    x = 128,078.02

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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.