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Finding the Fourth Proportional to 198.60, 297.82 and 70.28

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Solution

The fourth proportional to 198.60, 297.82 and 70.28 is: 105.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.60 : 297.82 = 70.28 : x
  2. Step 2: Convert to fraction form
    198.60/297.82 = 70.28/x
  3. Step 3: Cross multiply
    198.60x = 297.82 × 70.28
  4. Step 4: Simplify right side
    198.60x = 20,930.79
  5. Step 5: Solve for x
    x = 20,930.79/198.60
  6. Step 6: Final answer
    x = 105.39

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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.