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Finding the Fourth Proportional to 198.78, 297.93 and 90.33

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Solution

The fourth proportional to 198.78, 297.93 and 90.33 is: 135.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.78 : 297.93 = 90.33 : x
  2. Step 2: Convert to fraction form
    198.78/297.93 = 90.33/x
  3. Step 3: Cross multiply
    198.78x = 297.93 × 90.33
  4. Step 4: Simplify right side
    198.78x = 26,912.02
  5. Step 5: Solve for x
    x = 26,912.02/198.78
  6. Step 6: Final answer
    x = 135.39

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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.