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Finding the Fourth Proportional to 139,121, 191,987 and 79,505

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Solution

The fourth proportional to 139,121, 191,987 and 79,505 is: 109,716.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,121 : 191,987 = 79,505 : x
  2. Step 2: Convert to fraction form
    139,121/191,987 = 79,505/x
  3. Step 3: Cross multiply
    139,121x = 191,987 × 79,505
  4. Step 4: Simplify right side
    139,121x = 15,263,926,435
  5. Step 5: Solve for x
    x = 15,263,926,435/139,121
  6. Step 6: Final answer
    x = 109,716.91

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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.