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Finding the Fourth Proportional to 139,736.75, 192,841.43 and 78,493.77

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Solution

The fourth proportional to 139,736.75, 192,841.43 and 78,493.77 is: 108,324.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,736.75 : 192,841.43 = 78,493.77 : x
  2. Step 2: Convert to fraction form
    139,736.75/192,841.43 = 78,493.77/x
  3. Step 3: Cross multiply
    139,736.75x = 192,841.43 × 78,493.77
  4. Step 4: Simplify right side
    139,736.75x = 15,136,850,460.42
  5. Step 5: Solve for x
    x = 15,136,850,460.42/139,736.75
  6. Step 6: Final answer
    x = 108,324.05

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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.