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Finding the Fourth Proportional to 304.80, 420.49 and 221.97

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Solution

The fourth proportional to 304.80, 420.49 and 221.97 is: 306.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.80 : 420.49 = 221.97 : x
  2. Step 2: Convert to fraction form
    304.80/420.49 = 221.97/x
  3. Step 3: Cross multiply
    304.80x = 420.49 × 221.97
  4. Step 4: Simplify right side
    304.80x = 93,338.02
  5. Step 5: Solve for x
    x = 93,338.02/304.80
  6. Step 6: Final answer
    x = 306.23

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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.