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Finding the Fourth Proportional to 290.40, 435.60 and 107.76

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Solution

The fourth proportional to 290.40, 435.60 and 107.76 is: 161.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.40 : 435.60 = 107.76 : x
  2. Step 2: Convert to fraction form
    290.40/435.60 = 107.76/x
  3. Step 3: Cross multiply
    290.40x = 435.60 × 107.76
  4. Step 4: Simplify right side
    290.40x = 46,940.26
  5. Step 5: Solve for x
    x = 46,940.26/290.40
  6. Step 6: Final answer
    x = 161.64

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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.