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Finding the Fourth Proportional to 18,809.28, 28,213.92 and 8,406.72

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Solution

The fourth proportional to 18,809.28, 28,213.92 and 8,406.72 is: 12,610.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,809.28 : 28,213.92 = 8,406.72 : x
  2. Step 2: Convert to fraction form
    18,809.28/28,213.92 = 8,406.72/x
  3. Step 3: Cross multiply
    18,809.28x = 28,213.92 × 8,406.72
  4. Step 4: Simplify right side
    18,809.28x = 237,186,525.54
  5. Step 5: Solve for x
    x = 237,186,525.54/18,809.28
  6. Step 6: Final answer
    x = 12,610.08

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Similar ratio
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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.