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Finding the Fourth Proportional to 80.66, 121.46 and 72.62

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Solution

The fourth proportional to 80.66, 121.46 and 72.62 is: 109.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.66 : 121.46 = 72.62 : x
  2. Step 2: Convert to fraction form
    80.66/121.46 = 72.62/x
  3. Step 3: Cross multiply
    80.66x = 121.46 × 72.62
  4. Step 4: Simplify right side
    80.66x = 8,821.15
  5. Step 5: Solve for x
    x = 8,821.15/80.66
  6. Step 6: Final answer
    x = 109.37

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.