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Finding the Fourth Proportional to 121.15, 167.11 and 84.34

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Solution

The fourth proportional to 121.15, 167.11 and 84.34 is: 116.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.15 : 167.11 = 84.34 : x
  2. Step 2: Convert to fraction form
    121.15/167.11 = 84.34/x
  3. Step 3: Cross multiply
    121.15x = 167.11 × 84.34
  4. Step 4: Simplify right side
    121.15x = 14,094.06
  5. Step 5: Solve for x
    x = 14,094.06/121.15
  6. Step 6: Final answer
    x = 116.34

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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.