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Finding the Fourth Proportional to 139,691.75, 192,768.89 and 79,261.09

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Solution

The fourth proportional to 139,691.75, 192,768.89 and 79,261.09 is: 109,377.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,691.75 : 192,768.89 = 79,261.09 : x
  2. Step 2: Convert to fraction form
    139,691.75/192,768.89 = 79,261.09/x
  3. Step 3: Cross multiply
    139,691.75x = 192,768.89 × 79,261.09
  4. Step 4: Simplify right side
    139,691.75x = 15,279,071,461.26
  5. Step 5: Solve for x
    x = 15,279,071,461.26/139,691.75
  6. Step 6: Final answer
    x = 109,377.05

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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.