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Finding the Fourth Proportional to 3,978,564, 5,490,418.32 and 2,167,728

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Solution

The fourth proportional to 3,978,564, 5,490,418.32 and 2,167,728 is: 2,991,464.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978,564 : 5,490,418.32 = 2,167,728 : x
  2. Step 2: Convert to fraction form
    3,978,564/5,490,418.32 = 2,167,728/x
  3. Step 3: Cross multiply
    3,978,564x = 5,490,418.32 × 2,167,728
  4. Step 4: Simplify right side
    3,978,564x = 11,901,733,523,976.96
  5. Step 5: Solve for x
    x = 11,901,733,523,976.96/3,978,564
  6. Step 6: Final answer
    x = 2,991,464.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.