Home / 139,206.78-192,105.26-78,776.33

Finding the Fourth Proportional to 139,206.78, 192,105.26 and 78,776.33

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Solution

The fourth proportional to 139,206.78, 192,105.26 and 78,776.33 is: 108,711.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,206.78 : 192,105.26 = 78,776.33 : x
  2. Step 2: Convert to fraction form
    139,206.78/192,105.26 = 78,776.33/x
  3. Step 3: Cross multiply
    139,206.78x = 192,105.26 × 78,776.33
  4. Step 4: Simplify right side
    139,206.78x = 15,133,346,002.09
  5. Step 5: Solve for x
    x = 15,133,346,002.09/139,206.78
  6. Step 6: Final answer
    x = 108,711.27

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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.