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Finding the Fourth Proportional to 19,819.12, 29,729.56 and 8,124.12

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Solution

The fourth proportional to 19,819.12, 29,729.56 and 8,124.12 is: 12,186.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,819.12 : 29,729.56 = 8,124.12 : x
  2. Step 2: Convert to fraction form
    19,819.12/29,729.56 = 8,124.12/x
  3. Step 3: Cross multiply
    19,819.12x = 29,729.56 × 8,124.12
  4. Step 4: Simplify right side
    19,819.12x = 241,526,512.99
  5. Step 5: Solve for x
    x = 241,526,512.99/19,819.12
  6. Step 6: Final answer
    x = 12,186.54

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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.