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Finding the Fourth Proportional to 139,668.72, 192,747.21 and 79,241.91

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Solution

The fourth proportional to 139,668.72, 192,747.21 and 79,241.91 is: 109,356.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,668.72 : 192,747.21 = 79,241.91 : x
  2. Step 2: Convert to fraction form
    139,668.72/192,747.21 = 79,241.91/x
  3. Step 3: Cross multiply
    139,668.72x = 192,747.21 × 79,241.91
  4. Step 4: Simplify right side
    139,668.72x = 15,273,657,067.57
  5. Step 5: Solve for x
    x = 15,273,657,067.57/139,668.72
  6. Step 6: Final answer
    x = 109,356.32

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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.