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Finding the Fourth Proportional to 19,911.11, 29,855.21 and 11,913.84

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Solution

The fourth proportional to 19,911.11, 29,855.21 and 11,913.84 is: 17,863.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,911.11 : 29,855.21 = 11,913.84 : x
  2. Step 2: Convert to fraction form
    19,911.11/29,855.21 = 11,913.84/x
  3. Step 3: Cross multiply
    19,911.11x = 29,855.21 × 11,913.84
  4. Step 4: Simplify right side
    19,911.11x = 355,690,135.54
  5. Step 5: Solve for x
    x = 355,690,135.54/19,911.11
  6. Step 6: Final answer
    x = 17,863.91

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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.