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Finding the Fourth Proportional to 80.28, 120.45 and 34.64

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Solution

The fourth proportional to 80.28, 120.45 and 34.64 is: 51.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.28 : 120.45 = 34.64 : x
  2. Step 2: Convert to fraction form
    80.28/120.45 = 34.64/x
  3. Step 3: Cross multiply
    80.28x = 120.45 × 34.64
  4. Step 4: Simplify right side
    80.28x = 4,171.79
  5. Step 5: Solve for x
    x = 4,171.79/80.28
  6. Step 6: Final answer
    x = 51.97

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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.