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Finding the Fourth Proportional to 139,872.70, 209,809.05 and 120,845.80

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Solution

The fourth proportional to 139,872.70, 209,809.05 and 120,845.80 is: 181,268.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,872.70 : 209,809.05 = 120,845.80 : x
  2. Step 2: Convert to fraction form
    139,872.70/209,809.05 = 120,845.80/x
  3. Step 3: Cross multiply
    139,872.70x = 209,809.05 × 120,845.80
  4. Step 4: Simplify right side
    139,872.70x = 25,354,542,494.49
  5. Step 5: Solve for x
    x = 25,354,542,494.49/139,872.70
  6. Step 6: Final answer
    x = 181,268.70

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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.