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Finding the Fourth Proportional to 199.69, 299.21 and 122.71

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Solution

The fourth proportional to 199.69, 299.21 and 122.71 is: 183.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.69 : 299.21 = 122.71 : x
  2. Step 2: Convert to fraction form
    199.69/299.21 = 122.71/x
  3. Step 3: Cross multiply
    199.69x = 299.21 × 122.71
  4. Step 4: Simplify right side
    199.69x = 36,716.06
  5. Step 5: Solve for x
    x = 36,716.06/199.69
  6. Step 6: Final answer
    x = 183.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.