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Finding the Fourth Proportional to 231.63, 320.25 and 221.43

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Solution

The fourth proportional to 231.63, 320.25 and 221.43 is: 306.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.63 : 320.25 = 221.43 : x
  2. Step 2: Convert to fraction form
    231.63/320.25 = 221.43/x
  3. Step 3: Cross multiply
    231.63x = 320.25 × 221.43
  4. Step 4: Simplify right side
    231.63x = 70,912.96
  5. Step 5: Solve for x
    x = 70,912.96/231.63
  6. Step 6: Final answer
    x = 306.15

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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.