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Finding the Fourth Proportional to 121.98, 168.30 and 116.66

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Solution

The fourth proportional to 121.98, 168.30 and 116.66 is: 160.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.98 : 168.30 = 116.66 : x
  2. Step 2: Convert to fraction form
    121.98/168.30 = 116.66/x
  3. Step 3: Cross multiply
    121.98x = 168.30 × 116.66
  4. Step 4: Simplify right side
    121.98x = 19,633.88
  5. Step 5: Solve for x
    x = 19,633.88/121.98
  6. Step 6: Final answer
    x = 160.96

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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.