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Finding the Fourth Proportional to 198.65, 274.05 and 143.30

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Solution

The fourth proportional to 198.65, 274.05 and 143.30 is: 197.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.65 : 274.05 = 143.30 : x
  2. Step 2: Convert to fraction form
    198.65/274.05 = 143.30/x
  3. Step 3: Cross multiply
    198.65x = 274.05 × 143.30
  4. Step 4: Simplify right side
    198.65x = 39,272.05
  5. Step 5: Solve for x
    x = 39,272.05/198.65
  6. Step 6: Final answer
    x = 197.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.