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Finding the Fourth Proportional to 306.22, 421.98 and 218.74

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Solution

The fourth proportional to 306.22, 421.98 and 218.74 is: 301.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.22 : 421.98 = 218.74 : x
  2. Step 2: Convert to fraction form
    306.22/421.98 = 218.74/x
  3. Step 3: Cross multiply
    306.22x = 421.98 × 218.74
  4. Step 4: Simplify right side
    306.22x = 92,303.91
  5. Step 5: Solve for x
    x = 92,303.91/306.22
  6. Step 6: Final answer
    x = 301.43

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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.