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Finding the Fourth Proportional to 18,979,672.20, 28,469,508.30 and 13,903,499.40

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Solution

The fourth proportional to 18,979,672.20, 28,469,508.30 and 13,903,499.40 is: 20,855,249.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979,672.20 : 28,469,508.30 = 13,903,499.40 : x
  2. Step 2: Convert to fraction form
    18,979,672.20/28,469,508.30 = 13,903,499.40/x
  3. Step 3: Cross multiply
    18,979,672.20x = 28,469,508.30 × 13,903,499.40
  4. Step 4: Simplify right side
    18,979,672.20x = 395,825,791,567,345.06
  5. Step 5: Solve for x
    x = 395,825,791,567,345.06/18,979,672.20
  6. Step 6: Final answer
    x = 20,855,249.10

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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.