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Finding the Fourth Proportional to 199.81, 299.90 and 84.34

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Solution

The fourth proportional to 199.81, 299.90 and 84.34 is: 126.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.81 : 299.90 = 84.34 : x
  2. Step 2: Convert to fraction form
    199.81/299.90 = 84.34/x
  3. Step 3: Cross multiply
    199.81x = 299.90 × 84.34
  4. Step 4: Simplify right side
    199.81x = 25,293.57
  5. Step 5: Solve for x
    x = 25,293.57/199.81
  6. Step 6: Final answer
    x = 126.59

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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.