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Finding the Fourth Proportional to 290.92, 401.49 and 221.17

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Solution

The fourth proportional to 290.92, 401.49 and 221.17 is: 305.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.92 : 401.49 = 221.17 : x
  2. Step 2: Convert to fraction form
    290.92/401.49 = 221.17/x
  3. Step 3: Cross multiply
    290.92x = 401.49 × 221.17
  4. Step 4: Simplify right side
    290.92x = 88,797.54
  5. Step 5: Solve for x
    x = 88,797.54/290.92
  6. Step 6: Final answer
    x = 305.23

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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.