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Finding the Fourth Proportional to 139,241.88, 192,153.60 and 78,811.44

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Solution

The fourth proportional to 139,241.88, 192,153.60 and 78,811.44 is: 108,759.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,241.88 : 192,153.60 = 78,811.44 : x
  2. Step 2: Convert to fraction form
    139,241.88/192,153.60 = 78,811.44/x
  3. Step 3: Cross multiply
    139,241.88x = 192,153.60 × 78,811.44
  4. Step 4: Simplify right side
    139,241.88x = 15,143,901,917.18
  5. Step 5: Solve for x
    x = 15,143,901,917.18/139,241.88
  6. Step 6: Final answer
    x = 108,759.68

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1.5x scale

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.