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Finding the Fourth Proportional to 139,561.63, 192,590.94 and 79,137.79

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Solution

The fourth proportional to 139,561.63, 192,590.94 and 79,137.79 is: 109,207.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,561.63 : 192,590.94 = 79,137.79 : x
  2. Step 2: Convert to fraction form
    139,561.63/192,590.94 = 79,137.79/x
  3. Step 3: Cross multiply
    139,561.63x = 192,590.94 × 79,137.79
  4. Step 4: Simplify right side
    139,561.63x = 15,241,221,365.62
  5. Step 5: Solve for x
    x = 15,241,221,365.62/139,561.63
  6. Step 6: Final answer
    x = 109,207.82

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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.