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Finding the Fourth Proportional to 376.44, 519.40 and 221.20

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Solution

The fourth proportional to 376.44, 519.40 and 221.20 is: 305.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    376.44 : 519.40 = 221.20 : x
  2. Step 2: Convert to fraction form
    376.44/519.40 = 221.20/x
  3. Step 3: Cross multiply
    376.44x = 519.40 × 221.20
  4. Step 4: Simplify right side
    376.44x = 114,891.28
  5. Step 5: Solve for x
    x = 114,891.28/376.44
  6. Step 6: Final answer
    x = 305.20

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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.