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Finding the Fourth Proportional to 76.94, 115.40 and 28.18

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Solution

The fourth proportional to 76.94, 115.40 and 28.18 is: 42.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.94 : 115.40 = 28.18 : x
  2. Step 2: Convert to fraction form
    76.94/115.40 = 28.18/x
  3. Step 3: Cross multiply
    76.94x = 115.40 × 28.18
  4. Step 4: Simplify right side
    76.94x = 3,251.54
  5. Step 5: Solve for x
    x = 3,251.54/76.94
  6. Step 6: Final answer
    x = 42.26

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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.