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Finding the Fourth Proportional to 290.69, 401.33 and 220.75

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Solution

The fourth proportional to 290.69, 401.33 and 220.75 is: 304.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.69 : 401.33 = 220.75 : x
  2. Step 2: Convert to fraction form
    290.69/401.33 = 220.75/x
  3. Step 3: Cross multiply
    290.69x = 401.33 × 220.75
  4. Step 4: Simplify right side
    290.69x = 88,591.49
  5. Step 5: Solve for x
    x = 88,591.49/290.69
  6. Step 6: Final answer
    x = 304.77

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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.