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Finding the Fourth Proportional to 442.56, 663.20 and 321.20

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Solution

The fourth proportional to 442.56, 663.20 and 321.20 is: 481.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.56 : 663.20 = 321.20 : x
  2. Step 2: Convert to fraction form
    442.56/663.20 = 321.20/x
  3. Step 3: Cross multiply
    442.56x = 663.20 × 321.20
  4. Step 4: Simplify right side
    442.56x = 213,019.84
  5. Step 5: Solve for x
    x = 213,019.84/442.56
  6. Step 6: Final answer
    x = 481.34

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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.