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Finding the Fourth Proportional to 121.26, 180.84 and 104.25

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Solution

The fourth proportional to 121.26, 180.84 and 104.25 is: 155.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.26 : 180.84 = 104.25 : x
  2. Step 2: Convert to fraction form
    121.26/180.84 = 104.25/x
  3. Step 3: Cross multiply
    121.26x = 180.84 × 104.25
  4. Step 4: Simplify right side
    121.26x = 18,852.57
  5. Step 5: Solve for x
    x = 18,852.57/121.26
  6. Step 6: Final answer
    x = 155.47

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.