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Finding the Fourth Proportional to 39,819.40, 59,714.70 and 20,091.40

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Solution

The fourth proportional to 39,819.40, 59,714.70 and 20,091.40 is: 30,129.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,819.40 : 59,714.70 = 20,091.40 : x
  2. Step 2: Convert to fraction form
    39,819.40/59,714.70 = 20,091.40/x
  3. Step 3: Cross multiply
    39,819.40x = 59,714.70 × 20,091.40
  4. Step 4: Simplify right side
    39,819.40x = 1,199,751,923.58
  5. Step 5: Solve for x
    x = 1,199,751,923.58/39,819.40
  6. Step 6: Final answer
    x = 30,129.83

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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.