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Finding the Fourth Proportional to 221.49, 306.05 and 217.89

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Solution

The fourth proportional to 221.49, 306.05 and 217.89 is: 301.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.49 : 306.05 = 217.89 : x
  2. Step 2: Convert to fraction form
    221.49/306.05 = 217.89/x
  3. Step 3: Cross multiply
    221.49x = 306.05 × 217.89
  4. Step 4: Simplify right side
    221.49x = 66,685.23
  5. Step 5: Solve for x
    x = 66,685.23/221.49
  6. Step 6: Final answer
    x = 301.08

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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.