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Finding the Fourth Proportional to 121.15, 180.49 and 115.33

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Solution

The fourth proportional to 121.15, 180.49 and 115.33 is: 171.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.15 : 180.49 = 115.33 : x
  2. Step 2: Convert to fraction form
    121.15/180.49 = 115.33/x
  3. Step 3: Cross multiply
    121.15x = 180.49 × 115.33
  4. Step 4: Simplify right side
    121.15x = 20,815.91
  5. Step 5: Solve for x
    x = 20,815.91/121.15
  6. Step 6: Final answer
    x = 171.82

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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.