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Finding the Fourth Proportional to 168,505,928.20, 252,380,978.70 and 138,272,840.20

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Solution

The fourth proportional to 168,505,928.20, 252,380,978.70 and 138,272,840.20 is: 207,099,151.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    168,505,928.20 : 252,380,978.70 = 138,272,840.20 : x
  2. Step 2: Convert to fraction form
    168,505,928.20/252,380,978.70 = 138,272,840.20/x
  3. Step 3: Cross multiply
    168,505,928.20x = 252,380,978.70 × 138,272,840.20
  4. Step 4: Simplify right side
    168,505,928.20x = 34,897,434,737,304,700
  5. Step 5: Solve for x
    x = 34,897,434,737,304,700/168,505,928.20
  6. Step 6: Final answer
    x = 207,099,151.41

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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.