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Finding the Fourth Proportional to 11,988,436.60, 17,978,190.68 and 4,309,986.21

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Solution

The fourth proportional to 11,988,436.60, 17,978,190.68 and 4,309,986.21 is: 6,463,374.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,988,436.60 : 17,978,190.68 = 4,309,986.21 : x
  2. Step 2: Convert to fraction form
    11,988,436.60/17,978,190.68 = 4,309,986.21/x
  3. Step 3: Cross multiply
    11,988,436.60x = 17,978,190.68 × 4,309,986.21
  4. Step 4: Simplify right side
    11,988,436.60x = 77,485,753,989,743.70
  5. Step 5: Solve for x
    x = 77,485,753,989,743.70/11,988,436.60
  6. Step 6: Final answer
    x = 6,463,374.38

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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.