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Finding the Fourth Proportional to 199.99, 299.66 and 122.72

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Solution

The fourth proportional to 199.99, 299.66 and 122.72 is: 183.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.99 : 299.66 = 122.72 : x
  2. Step 2: Convert to fraction form
    199.99/299.66 = 122.72/x
  3. Step 3: Cross multiply
    199.99x = 299.66 × 122.72
  4. Step 4: Simplify right side
    199.99x = 36,773.22
  5. Step 5: Solve for x
    x = 36,773.22/199.99
  6. Step 6: Final answer
    x = 183.88

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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.