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Finding the Fourth Proportional to 199.15, 299.03 and 121.89

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Solution

The fourth proportional to 199.15, 299.03 and 121.89 is: 183.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.15 : 299.03 = 121.89 : x
  2. Step 2: Convert to fraction form
    199.15/299.03 = 121.89/x
  3. Step 3: Cross multiply
    199.15x = 299.03 × 121.89
  4. Step 4: Simplify right side
    199.15x = 36,449.28
  5. Step 5: Solve for x
    x = 36,449.28/199.15
  6. Step 6: Final answer
    x = 183.03

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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.