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Finding the Fourth Proportional to 199.08, 298.44 and 90.78

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Solution

The fourth proportional to 199.08, 298.44 and 90.78 is: 136.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.08 : 298.44 = 90.78 : x
  2. Step 2: Convert to fraction form
    199.08/298.44 = 90.78/x
  3. Step 3: Cross multiply
    199.08x = 298.44 × 90.78
  4. Step 4: Simplify right side
    199.08x = 27,092.38
  5. Step 5: Solve for x
    x = 27,092.38/199.08
  6. Step 6: Final answer
    x = 136.09

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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.