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Finding the Fourth Proportional to 198.80, 298.43 and 117.70

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Solution

The fourth proportional to 198.80, 298.43 and 117.70 is: 176.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.80 : 298.43 = 117.70 : x
  2. Step 2: Convert to fraction form
    198.80/298.43 = 117.70/x
  3. Step 3: Cross multiply
    198.80x = 298.43 × 117.70
  4. Step 4: Simplify right side
    198.80x = 35,126.66
  5. Step 5: Solve for x
    x = 35,126.66/198.80
  6. Step 6: Final answer
    x = 176.69

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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.