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Finding the Fourth Proportional to 198.43, 297.60 and 90.25

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Solution

The fourth proportional to 198.43, 297.60 and 90.25 is: 135.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.43 : 297.60 = 90.25 : x
  2. Step 2: Convert to fraction form
    198.43/297.60 = 90.25/x
  3. Step 3: Cross multiply
    198.43x = 297.60 × 90.25
  4. Step 4: Simplify right side
    198.43x = 26,858.40
  5. Step 5: Solve for x
    x = 26,858.40/198.43
  6. Step 6: Final answer
    x = 135.35

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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.