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Finding the Fourth Proportional to 199.31, 298.76 and 107.91

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Solution

The fourth proportional to 199.31, 298.76 and 107.91 is: 161.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.31 : 298.76 = 107.91 : x
  2. Step 2: Convert to fraction form
    199.31/298.76 = 107.91/x
  3. Step 3: Cross multiply
    199.31x = 298.76 × 107.91
  4. Step 4: Simplify right side
    199.31x = 32,238.65
  5. Step 5: Solve for x
    x = 32,238.65/199.31
  6. Step 6: Final answer
    x = 161.76

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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.