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Finding the Fourth Proportional to 379.80, 523.62 and 321.48

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Solution

The fourth proportional to 379.80, 523.62 and 321.48 is: 443.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.80 : 523.62 = 321.48 : x
  2. Step 2: Convert to fraction form
    379.80/523.62 = 321.48/x
  3. Step 3: Cross multiply
    379.80x = 523.62 × 321.48
  4. Step 4: Simplify right side
    379.80x = 168,333.36
  5. Step 5: Solve for x
    x = 168,333.36/379.80
  6. Step 6: Final answer
    x = 443.22

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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.