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Finding the Fourth Proportional to 306.15, 422.33 and 212.73

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Solution

The fourth proportional to 306.15, 422.33 and 212.73 is: 293.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.15 : 422.33 = 212.73 : x
  2. Step 2: Convert to fraction form
    306.15/422.33 = 212.73/x
  3. Step 3: Cross multiply
    306.15x = 422.33 × 212.73
  4. Step 4: Simplify right side
    306.15x = 89,841.20
  5. Step 5: Solve for x
    x = 89,841.20/306.15
  6. Step 6: Final answer
    x = 293.45

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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.