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Finding the Fourth Proportional to 121.44, 182.20 and 72.68

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Solution

The fourth proportional to 121.44, 182.20 and 72.68 is: 109.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.44 : 182.20 = 72.68 : x
  2. Step 2: Convert to fraction form
    121.44/182.20 = 72.68/x
  3. Step 3: Cross multiply
    121.44x = 182.20 × 72.68
  4. Step 4: Simplify right side
    121.44x = 13,242.30
  5. Step 5: Solve for x
    x = 13,242.30/121.44
  6. Step 6: Final answer
    x = 109.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.