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Finding the Fourth Proportional to 304.16, 419.36 and 221.28

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Solution

The fourth proportional to 304.16, 419.36 and 221.28 is: 305.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.16 : 419.36 = 221.28 : x
  2. Step 2: Convert to fraction form
    304.16/419.36 = 221.28/x
  3. Step 3: Cross multiply
    304.16x = 419.36 × 221.28
  4. Step 4: Simplify right side
    304.16x = 92,795.98
  5. Step 5: Solve for x
    x = 92,795.98/304.16
  6. Step 6: Final answer
    x = 305.09

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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.