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Finding the Fourth Proportional to 80.41, 120.05 and 71.32

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Solution

The fourth proportional to 80.41, 120.05 and 71.32 is: 106.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.41 : 120.05 = 71.32 : x
  2. Step 2: Convert to fraction form
    80.41/120.05 = 71.32/x
  3. Step 3: Cross multiply
    80.41x = 120.05 × 71.32
  4. Step 4: Simplify right side
    80.41x = 8,561.97
  5. Step 5: Solve for x
    x = 8,561.97/80.41
  6. Step 6: Final answer
    x = 106.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.