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Finding the Fourth Proportional to 196.21, 270.62 and 143.74

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Solution

The fourth proportional to 196.21, 270.62 and 143.74 is: 198.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.21 : 270.62 = 143.74 : x
  2. Step 2: Convert to fraction form
    196.21/270.62 = 143.74/x
  3. Step 3: Cross multiply
    196.21x = 270.62 × 143.74
  4. Step 4: Simplify right side
    196.21x = 38,898.54
  5. Step 5: Solve for x
    x = 38,898.54/196.21
  6. Step 6: Final answer
    x = 198.25

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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.