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Finding the Fourth Proportional to 121, 166.98 and 111.84

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Solution

The fourth proportional to 121, 166.98 and 111.84 is: 154.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    121 : 166.98 = 111.84 : x
  2. Step 2: Convert to fraction form
    121/166.98 = 111.84/x
  3. Step 3: Cross multiply
    121x = 166.98 × 111.84
  4. Step 4: Simplify right side
    121x = 18,675.04
  5. Step 5: Solve for x
    x = 18,675.04/121
  6. Step 6: Final answer
    x = 154.34

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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.