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Finding the Fourth Proportional to 198.40, 297.60 and 76.58

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Solution

The fourth proportional to 198.40, 297.60 and 76.58 is: 114.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.40 : 297.60 = 76.58 : x
  2. Step 2: Convert to fraction form
    198.40/297.60 = 76.58/x
  3. Step 3: Cross multiply
    198.40x = 297.60 × 76.58
  4. Step 4: Simplify right side
    198.40x = 22,788.80
  5. Step 5: Solve for x
    x = 22,788.80/198.40
  6. Step 6: Final answer
    x = 114.86

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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.