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Finding the Fourth Proportional to 330.80, 496.20 and 221.45

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Solution

The fourth proportional to 330.80, 496.20 and 221.45 is: 332.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.80 : 496.20 = 221.45 : x
  2. Step 2: Convert to fraction form
    330.80/496.20 = 221.45/x
  3. Step 3: Cross multiply
    330.80x = 496.20 × 221.45
  4. Step 4: Simplify right side
    330.80x = 109,883.49
  5. Step 5: Solve for x
    x = 109,883.49/330.80
  6. Step 6: Final answer
    x = 332.18

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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.