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Finding the Fourth Proportional to 199.75, 299.66 and 69.79

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Solution

The fourth proportional to 199.75, 299.66 and 69.79 is: 104.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.75 : 299.66 = 69.79 : x
  2. Step 2: Convert to fraction form
    199.75/299.66 = 69.79/x
  3. Step 3: Cross multiply
    199.75x = 299.66 × 69.79
  4. Step 4: Simplify right side
    199.75x = 20,911.42
  5. Step 5: Solve for x
    x = 20,911.42/199.75
  6. Step 6: Final answer
    x = 104.69

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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.