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Finding the Fourth Proportional to 303.82, 419.52 and 221.20

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Solution

The fourth proportional to 303.82, 419.52 and 221.20 is: 305.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.82 : 419.52 = 221.20 : x
  2. Step 2: Convert to fraction form
    303.82/419.52 = 221.20/x
  3. Step 3: Cross multiply
    303.82x = 419.52 × 221.20
  4. Step 4: Simplify right side
    303.82x = 92,797.82
  5. Step 5: Solve for x
    x = 92,797.82/303.82
  6. Step 6: Final answer
    x = 305.44

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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.