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Finding the Fourth Proportional to 80.19, 120.38 and 67.43

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Solution

The fourth proportional to 80.19, 120.38 and 67.43 is: 101.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.19 : 120.38 = 67.43 : x
  2. Step 2: Convert to fraction form
    80.19/120.38 = 67.43/x
  3. Step 3: Cross multiply
    80.19x = 120.38 × 67.43
  4. Step 4: Simplify right side
    80.19x = 8,116.28
  5. Step 5: Solve for x
    x = 8,116.28/80.19
  6. Step 6: Final answer
    x = 101.21

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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.