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Finding the Fourth Proportional to 290.85, 401.95 and 238.31

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Solution

The fourth proportional to 290.85, 401.95 and 238.31 is: 329.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.85 : 401.95 = 238.31 : x
  2. Step 2: Convert to fraction form
    290.85/401.95 = 238.31/x
  3. Step 3: Cross multiply
    290.85x = 401.95 × 238.31
  4. Step 4: Simplify right side
    290.85x = 95,791.04
  5. Step 5: Solve for x
    x = 95,791.04/290.85
  6. Step 6: Final answer
    x = 329.34

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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.