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Finding the Fourth Proportional to 139,668.42, 192,746.79 and 79,241.61

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Solution

The fourth proportional to 139,668.42, 192,746.79 and 79,241.61 is: 109,355.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,668.42 : 192,746.79 = 79,241.61 : x
  2. Step 2: Convert to fraction form
    139,668.42/192,746.79 = 79,241.61/x
  3. Step 3: Cross multiply
    139,668.42x = 192,746.79 × 79,241.61
  4. Step 4: Simplify right side
    139,668.42x = 15,273,564,601.99
  5. Step 5: Solve for x
    x = 15,273,564,601.99/139,668.42
  6. Step 6: Final answer
    x = 109,355.90

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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.