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Finding the Fourth Proportional to 304.31, 419.73 and 221.69

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Solution

The fourth proportional to 304.31, 419.73 and 221.69 is: 305.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.31 : 419.73 = 221.69 : x
  2. Step 2: Convert to fraction form
    304.31/419.73 = 221.69/x
  3. Step 3: Cross multiply
    304.31x = 419.73 × 221.69
  4. Step 4: Simplify right side
    304.31x = 93,049.94
  5. Step 5: Solve for x
    x = 93,049.94/304.31
  6. Step 6: Final answer
    x = 305.77

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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.