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Finding the Fourth Proportional to 290.21, 435.05 and 107.55

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Solution

The fourth proportional to 290.21, 435.05 and 107.55 is: 161.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.21 : 435.05 = 107.55 : x
  2. Step 2: Convert to fraction form
    290.21/435.05 = 107.55/x
  3. Step 3: Cross multiply
    290.21x = 435.05 × 107.55
  4. Step 4: Simplify right side
    290.21x = 46,789.09
  5. Step 5: Solve for x
    x = 46,789.09/290.21
  6. Step 6: Final answer
    x = 161.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.