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Finding the Fourth Proportional to 139,969,270.80, 209,953,906.20 and 133,591,978.80

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Solution

The fourth proportional to 139,969,270.80, 209,953,906.20 and 133,591,978.80 is: 200,387,968.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,270.80 : 209,953,906.20 = 133,591,978.80 : x
  2. Step 2: Convert to fraction form
    139,969,270.80/209,953,906.20 = 133,591,978.80/x
  3. Step 3: Cross multiply
    139,969,270.80x = 209,953,906.20 × 133,591,978.80
  4. Step 4: Simplify right side
    139,969,270.80x = 28,048,157,786,047,588
  5. Step 5: Solve for x
    x = 28,048,157,786,047,588/139,969,270.80
  6. Step 6: Final answer
    x = 200,387,968.20

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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.