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Finding the Fourth Proportional to 18,979,613.70, 28,469,420.55 and 13,903,440.90

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Solution

The fourth proportional to 18,979,613.70, 28,469,420.55 and 13,903,440.90 is: 20,855,161.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979,613.70 : 28,469,420.55 = 13,903,440.90 : x
  2. Step 2: Convert to fraction form
    18,979,613.70/28,469,420.55 = 13,903,440.90/x
  3. Step 3: Cross multiply
    18,979,613.70x = 28,469,420.55 × 13,903,440.90
  4. Step 4: Simplify right side
    18,979,613.70x = 395,822,906,074,170.50
  5. Step 5: Solve for x
    x = 395,822,906,074,170.50/18,979,613.70
  6. Step 6: Final answer
    x = 20,855,161.35

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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.