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Finding the Fourth Proportional to 20,808,747.70, 31,213,121.55 and 20,808,747.70

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Solution

The fourth proportional to 20,808,747.70, 31,213,121.55 and 20,808,747.70 is: 31,213,121.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808,747.70 : 31,213,121.55 = 20,808,747.70 : x
  2. Step 2: Convert to fraction form
    20,808,747.70/31,213,121.55 = 20,808,747.70/x
  3. Step 3: Cross multiply
    20,808,747.70x = 31,213,121.55 × 20,808,747.70
  4. Step 4: Simplify right side
    20,808,747.70x = 649,505,971,263,382.88
  5. Step 5: Solve for x
    x = 649,505,971,263,382.88/20,808,747.70
  6. Step 6: Final answer
    x = 31,213,121.55

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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.