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Finding the Fourth Proportional to 306.21, 421.98 and 195.49

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Solution

The fourth proportional to 306.21, 421.98 and 195.49 is: 269.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.21 : 421.98 = 195.49 : x
  2. Step 2: Convert to fraction form
    306.21/421.98 = 195.49/x
  3. Step 3: Cross multiply
    306.21x = 421.98 × 195.49
  4. Step 4: Simplify right side
    306.21x = 82,494.68
  5. Step 5: Solve for x
    x = 82,494.68/306.21
  6. Step 6: Final answer
    x = 269.40

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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.