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Finding the Fourth Proportional to 331.20, 493.92 and 327.60

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Solution

The fourth proportional to 331.20, 493.92 and 327.60 is: 488.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.20 : 493.92 = 327.60 : x
  2. Step 2: Convert to fraction form
    331.20/493.92 = 327.60/x
  3. Step 3: Cross multiply
    331.20x = 493.92 × 327.60
  4. Step 4: Simplify right side
    331.20x = 161,808.19
  5. Step 5: Solve for x
    x = 161,808.19/331.20
  6. Step 6: Final answer
    x = 488.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.