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Finding the Fourth Proportional to 369.20, 553.79 and 206.54

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Solution

The fourth proportional to 369.20, 553.79 and 206.54 is: 309.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.20 : 553.79 = 206.54 : x
  2. Step 2: Convert to fraction form
    369.20/553.79 = 206.54/x
  3. Step 3: Cross multiply
    369.20x = 553.79 × 206.54
  4. Step 4: Simplify right side
    369.20x = 114,375.98
  5. Step 5: Solve for x
    x = 114,375.98/369.20
  6. Step 6: Final answer
    x = 309.80

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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.