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Finding the Fourth Proportional to 121.21, 167.36 and 111.99

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Solution

The fourth proportional to 121.21, 167.36 and 111.99 is: 154.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.21 : 167.36 = 111.99 : x
  2. Step 2: Convert to fraction form
    121.21/167.36 = 111.99/x
  3. Step 3: Cross multiply
    121.21x = 167.36 × 111.99
  4. Step 4: Simplify right side
    121.21x = 18,742.65
  5. Step 5: Solve for x
    x = 18,742.65/121.21
  6. Step 6: Final answer
    x = 154.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.