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Finding the Fourth Proportional to 38,405.99, 57,608.99 and 12,112.79

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Solution

The fourth proportional to 38,405.99, 57,608.99 and 12,112.79 is: 18,169.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,405.99 : 57,608.99 = 12,112.79 : x
  2. Step 2: Convert to fraction form
    38,405.99/57,608.99 = 12,112.79/x
  3. Step 3: Cross multiply
    38,405.99x = 57,608.99 × 12,112.79
  4. Step 4: Simplify right side
    38,405.99x = 697,805,249.37
  5. Step 5: Solve for x
    x = 697,805,249.37/38,405.99
  6. Step 6: Final answer
    x = 18,169.18

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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.