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Finding the Fourth Proportional to 369.42, 553.74 and 321.30

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Solution

The fourth proportional to 369.42, 553.74 and 321.30 is: 481.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.42 : 553.74 = 321.30 : x
  2. Step 2: Convert to fraction form
    369.42/553.74 = 321.30/x
  3. Step 3: Cross multiply
    369.42x = 553.74 × 321.30
  4. Step 4: Simplify right side
    369.42x = 177,916.66
  5. Step 5: Solve for x
    x = 177,916.66/369.42
  6. Step 6: Final answer
    x = 481.61

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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.