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Finding the Fourth Proportional to 121.15, 167.91 and 109

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Solution

The fourth proportional to 121.15, 167.91 and 109 is: 151.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.15 : 167.91 = 109 : x
  2. Step 2: Convert to fraction form
    121.15/167.91 = 109/x
  3. Step 3: Cross multiply
    121.15x = 167.91 × 109
  4. Step 4: Simplify right side
    121.15x = 18,302.19
  5. Step 5: Solve for x
    x = 18,302.19/121.15
  6. Step 6: Final answer
    x = 151.07

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.