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Finding the Fourth Proportional to 121.19, 167.24 and 72.11

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Solution

The fourth proportional to 121.19, 167.24 and 72.11 is: 99.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.19 : 167.24 = 72.11 : x
  2. Step 2: Convert to fraction form
    121.19/167.24 = 72.11/x
  3. Step 3: Cross multiply
    121.19x = 167.24 × 72.11
  4. Step 4: Simplify right side
    121.19x = 12,059.68
  5. Step 5: Solve for x
    x = 12,059.68/121.19
  6. Step 6: Final answer
    x = 99.51

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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.