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Finding the Fourth Proportional to 139,765.57, 192,879.65 and 79,330.56

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Solution

The fourth proportional to 139,765.57, 192,879.65 and 79,330.56 is: 109,477.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,765.57 : 192,879.65 = 79,330.56 : x
  2. Step 2: Convert to fraction form
    139,765.57/192,879.65 = 79,330.56/x
  3. Step 3: Cross multiply
    139,765.57x = 192,879.65 × 79,330.56
  4. Step 4: Simplify right side
    139,765.57x = 15,301,250,647.10
  5. Step 5: Solve for x
    x = 15,301,250,647.10/139,765.57
  6. Step 6: Final answer
    x = 109,477.97

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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.