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Finding the Fourth Proportional to 290.36, 435.65 and 107.76

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Solution

The fourth proportional to 290.36, 435.65 and 107.76 is: 161.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.36 : 435.65 = 107.76 : x
  2. Step 2: Convert to fraction form
    290.36/435.65 = 107.76/x
  3. Step 3: Cross multiply
    290.36x = 435.65 × 107.76
  4. Step 4: Simplify right side
    290.36x = 46,945.64
  5. Step 5: Solve for x
    x = 46,945.64/290.36
  6. Step 6: Final answer
    x = 161.68

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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.