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Finding the Fourth Proportional to 198.58, 297.35 and 128.98

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Solution

The fourth proportional to 198.58, 297.35 and 128.98 is: 193.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.58 : 297.35 = 128.98 : x
  2. Step 2: Convert to fraction form
    198.58/297.35 = 128.98/x
  3. Step 3: Cross multiply
    198.58x = 297.35 × 128.98
  4. Step 4: Simplify right side
    198.58x = 38,352.20
  5. Step 5: Solve for x
    x = 38,352.20/198.58
  6. Step 6: Final answer
    x = 193.13

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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.