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Finding the Fourth Proportional to 85,910.57, 128,814.07 and 38,517.09

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Solution

The fourth proportional to 85,910.57, 128,814.07 and 38,517.09 is: 57,752.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,910.57 : 128,814.07 = 38,517.09 : x
  2. Step 2: Convert to fraction form
    85,910.57/128,814.07 = 38,517.09/x
  3. Step 3: Cross multiply
    85,910.57x = 128,814.07 × 38,517.09
  4. Step 4: Simplify right side
    85,910.57x = 4,961,543,815.53
  5. Step 5: Solve for x
    x = 4,961,543,815.53/85,910.57
  6. Step 6: Final answer
    x = 57,752.42

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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.