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Finding the Fourth Proportional to 70,379.12, 105,571.92 and 39,190.88

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Solution

The fourth proportional to 70,379.12, 105,571.92 and 39,190.88 is: 58,788.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,379.12 : 105,571.92 = 39,190.88 : x
  2. Step 2: Convert to fraction form
    70,379.12/105,571.92 = 39,190.88/x
  3. Step 3: Cross multiply
    70,379.12x = 105,571.92 × 39,190.88
  4. Step 4: Simplify right side
    70,379.12x = 4,137,456,448.09
  5. Step 5: Solve for x
    x = 4,137,456,448.09/70,379.12
  6. Step 6: Final answer
    x = 58,788.12

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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.