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Finding the Fourth Proportional to 395.15, 591.97 and 221.30

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Solution

The fourth proportional to 395.15, 591.97 and 221.30 is: 331.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.15 : 591.97 = 221.30 : x
  2. Step 2: Convert to fraction form
    395.15/591.97 = 221.30/x
  3. Step 3: Cross multiply
    395.15x = 591.97 × 221.30
  4. Step 4: Simplify right side
    395.15x = 131,000.55
  5. Step 5: Solve for x
    x = 131,000.55/395.15
  6. Step 6: Final answer
    x = 331.52

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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.