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Finding the Fourth Proportional to 18,896.89, 28,355.78 and 7,800.98

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Solution

The fourth proportional to 18,896.89, 28,355.78 and 7,800.98 is: 11,705.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,896.89 : 28,355.78 = 7,800.98 : x
  2. Step 2: Convert to fraction form
    18,896.89/28,355.78 = 7,800.98/x
  3. Step 3: Cross multiply
    18,896.89x = 28,355.78 × 7,800.98
  4. Step 4: Simplify right side
    18,896.89x = 221,202,872.66
  5. Step 5: Solve for x
    x = 221,202,872.66/18,896.89
  6. Step 6: Final answer
    x = 11,705.78

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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.