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Finding the Fourth Proportional to 139,709.75, 192,794.09 and 79,276.79

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Solution

The fourth proportional to 139,709.75, 192,794.09 and 79,276.79 is: 109,398.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,709.75 : 192,794.09 = 79,276.79 : x
  2. Step 2: Convert to fraction form
    139,709.75/192,794.09 = 79,276.79/x
  3. Step 3: Cross multiply
    139,709.75x = 192,794.09 × 79,276.79
  4. Step 4: Simplify right side
    139,709.75x = 15,284,096,671.77
  5. Step 5: Solve for x
    x = 15,284,096,671.77/139,709.75
  6. Step 6: Final answer
    x = 109,398.93

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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.