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Finding the Fourth Proportional to 3,889,644.32, 5,367,978.60 and 2,171,100.80

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Solution

The fourth proportional to 3,889,644.32, 5,367,978.60 and 2,171,100.80 is: 2,996,269.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889,644.32 : 5,367,978.60 = 2,171,100.80 : x
  2. Step 2: Convert to fraction form
    3,889,644.32/5,367,978.60 = 2,171,100.80/x
  3. Step 3: Cross multiply
    3,889,644.32x = 5,367,978.60 × 2,171,100.80
  4. Step 4: Simplify right side
    3,889,644.32x = 11,654,422,632,842.88
  5. Step 5: Solve for x
    x = 11,654,422,632,842.88/3,889,644.32
  6. Step 6: Final answer
    x = 2,996,269.50

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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.