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Finding the Fourth Proportional to 18,928,471.20, 28,392,706.80 and 10,405,514.40

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Solution

The fourth proportional to 18,928,471.20, 28,392,706.80 and 10,405,514.40 is: 15,608,271.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928,471.20 : 28,392,706.80 = 10,405,514.40 : x
  2. Step 2: Convert to fraction form
    18,928,471.20/28,392,706.80 = 10,405,514.40/x
  3. Step 3: Cross multiply
    18,928,471.20x = 28,392,706.80 × 10,405,514.40
  4. Step 4: Simplify right side
    18,928,471.20x = 295,440,719,462,377.94
  5. Step 5: Solve for x
    x = 295,440,719,462,377.94/18,928,471.20
  6. Step 6: Final answer
    x = 15,608,271.60

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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.