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Finding the Fourth Proportional to 121.22, 167.31 and 90.23

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Solution

The fourth proportional to 121.22, 167.31 and 90.23 is: 124.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.22 : 167.31 = 90.23 : x
  2. Step 2: Convert to fraction form
    121.22/167.31 = 90.23/x
  3. Step 3: Cross multiply
    121.22x = 167.31 × 90.23
  4. Step 4: Simplify right side
    121.22x = 15,096.38
  5. Step 5: Solve for x
    x = 15,096.38/121.22
  6. Step 6: Final answer
    x = 124.54

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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.