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Finding the Fourth Proportional to 139,930.74, 193,109.67 and 79,511.67

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Solution

The fourth proportional to 139,930.74, 193,109.67 and 79,511.67 is: 109,729.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,930.74 : 193,109.67 = 79,511.67 : x
  2. Step 2: Convert to fraction form
    139,930.74/193,109.67 = 79,511.67/x
  3. Step 3: Cross multiply
    139,930.74x = 193,109.67 × 79,511.67
  4. Step 4: Simplify right side
    139,930.74x = 15,354,472,354.85
  5. Step 5: Solve for x
    x = 15,354,472,354.85/139,930.74
  6. Step 6: Final answer
    x = 109,729.09

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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.