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Finding the Fourth Proportional to 80.21, 120.84 and 79.26

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Solution

The fourth proportional to 80.21, 120.84 and 79.26 is: 119.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.21 : 120.84 = 79.26 : x
  2. Step 2: Convert to fraction form
    80.21/120.84 = 79.26/x
  3. Step 3: Cross multiply
    80.21x = 120.84 × 79.26
  4. Step 4: Simplify right side
    80.21x = 9,577.78
  5. Step 5: Solve for x
    x = 9,577.78/80.21
  6. Step 6: Final answer
    x = 119.41

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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.