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Finding the Fourth Proportional to 243, 363.96 and 221.94

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Solution

The fourth proportional to 243, 363.96 and 221.94 is: 332.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    243 : 363.96 = 221.94 : x
  2. Step 2: Convert to fraction form
    243/363.96 = 221.94/x
  3. Step 3: Cross multiply
    243x = 363.96 × 221.94
  4. Step 4: Simplify right side
    243x = 80,777.28
  5. Step 5: Solve for x
    x = 80,777.28/243
  6. Step 6: Final answer
    x = 332.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.