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Finding the Fourth Proportional to 21,664,978.22, 29,847,422.09 and 15,128,253.92

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Solution

The fourth proportional to 21,664,978.22, 29,847,422.09 and 15,128,253.92 is: 20,841,903.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,664,978.22 : 29,847,422.09 = 15,128,253.92 : x
  2. Step 2: Convert to fraction form
    21,664,978.22/29,847,422.09 = 15,128,253.92/x
  3. Step 3: Cross multiply
    21,664,978.22x = 29,847,422.09 × 15,128,253.92
  4. Step 4: Simplify right side
    21,664,978.22x = 451,539,380,234,937.06
  5. Step 5: Solve for x
    x = 451,539,380,234,937.06/21,664,978.22
  6. Step 6: Final answer
    x = 20,841,903.26

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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.