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Finding the Fourth Proportional to 80.17, 120.16 and 28.79

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Solution

The fourth proportional to 80.17, 120.16 and 28.79 is: 43.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.17 : 120.16 = 28.79 : x
  2. Step 2: Convert to fraction form
    80.17/120.16 = 28.79/x
  3. Step 3: Cross multiply
    80.17x = 120.16 × 28.79
  4. Step 4: Simplify right side
    80.17x = 3,458.81
  5. Step 5: Solve for x
    x = 3,458.81/80.17
  6. Step 6: Final answer
    x = 43.14

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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.