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Finding the Fourth Proportional to 121.82, 168.28 and 84.96

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Solution

The fourth proportional to 121.82, 168.28 and 84.96 is: 117.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.82 : 168.28 = 84.96 : x
  2. Step 2: Convert to fraction form
    121.82/168.28 = 84.96/x
  3. Step 3: Cross multiply
    121.82x = 168.28 × 84.96
  4. Step 4: Simplify right side
    121.82x = 14,296.86
  5. Step 5: Solve for x
    x = 14,296.86/121.82
  6. Step 6: Final answer
    x = 117.37

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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.