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Finding the Fourth Proportional to 20,991,616.60, 31,487,424.90 and 20,991,616.60

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Solution

The fourth proportional to 20,991,616.60, 31,487,424.90 and 20,991,616.60 is: 31,487,424.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991,616.60 : 31,487,424.90 = 20,991,616.60 : x
  2. Step 2: Convert to fraction form
    20,991,616.60/31,487,424.90 = 20,991,616.60/x
  3. Step 3: Cross multiply
    20,991,616.60x = 31,487,424.90 × 20,991,616.60
  4. Step 4: Simplify right side
    20,991,616.60x = 660,971,951,222,093.38
  5. Step 5: Solve for x
    x = 660,971,951,222,093.38/20,991,616.60
  6. Step 6: Final answer
    x = 31,487,424.90

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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.