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Finding the Fourth Proportional to 121.88, 167.98 and 111.56

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Solution

The fourth proportional to 121.88, 167.98 and 111.56 is: 153.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.88 : 167.98 = 111.56 : x
  2. Step 2: Convert to fraction form
    121.88/167.98 = 111.56/x
  3. Step 3: Cross multiply
    121.88x = 167.98 × 111.56
  4. Step 4: Simplify right side
    121.88x = 18,739.85
  5. Step 5: Solve for x
    x = 18,739.85/121.88
  6. Step 6: Final answer
    x = 153.76

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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.