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Finding the Fourth Proportional to 199.42, 299.17 and 96.78

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Solution

The fourth proportional to 199.42, 299.17 and 96.78 is: 145.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.42 : 299.17 = 96.78 : x
  2. Step 2: Convert to fraction form
    199.42/299.17 = 96.78/x
  3. Step 3: Cross multiply
    199.42x = 299.17 × 96.78
  4. Step 4: Simplify right side
    199.42x = 28,951.69
  5. Step 5: Solve for x
    x = 28,951.69/199.42
  6. Step 6: Final answer
    x = 145.18

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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.