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Finding the Fourth Proportional to 139,968,142.40, 209,952,213.60 and 128,882,676.80

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Solution

The fourth proportional to 139,968,142.40, 209,952,213.60 and 128,882,676.80 is: 193,324,015.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,142.40 : 209,952,213.60 = 128,882,676.80 : x
  2. Step 2: Convert to fraction form
    139,968,142.40/209,952,213.60 = 128,882,676.80/x
  3. Step 3: Cross multiply
    139,968,142.40x = 209,952,213.60 × 128,882,676.80
  4. Step 4: Simplify right side
    139,968,142.40x = 27,059,203,288,853,364
  5. Step 5: Solve for x
    x = 27,059,203,288,853,364/139,968,142.40
  6. Step 6: Final answer
    x = 193,324,015.20

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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.