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Finding the Fourth Proportional to 369.28, 509.82 and 221.96

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Solution

The fourth proportional to 369.28, 509.82 and 221.96 is: 306.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.28 : 509.82 = 221.96 : x
  2. Step 2: Convert to fraction form
    369.28/509.82 = 221.96/x
  3. Step 3: Cross multiply
    369.28x = 509.82 × 221.96
  4. Step 4: Simplify right side
    369.28x = 113,159.65
  5. Step 5: Solve for x
    x = 113,159.65/369.28
  6. Step 6: Final answer
    x = 306.43

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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.