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Finding the Fourth Proportional to 85,611.90, 128,408.10 and 33,016.98

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Solution

The fourth proportional to 85,611.90, 128,408.10 and 33,016.98 is: 49,521.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,611.90 : 128,408.10 = 33,016.98 : x
  2. Step 2: Convert to fraction form
    85,611.90/128,408.10 = 33,016.98/x
  3. Step 3: Cross multiply
    85,611.90x = 128,408.10 × 33,016.98
  4. Step 4: Simplify right side
    85,611.90x = 4,239,647,669.54
  5. Step 5: Solve for x
    x = 4,239,647,669.54/85,611.90
  6. Step 6: Final answer
    x = 49,521.71

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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.