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Finding the Fourth Proportional to 278.28, 383.94 and 208.44

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Solution

The fourth proportional to 278.28, 383.94 and 208.44 is: 287.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.28 : 383.94 = 208.44 : x
  2. Step 2: Convert to fraction form
    278.28/383.94 = 208.44/x
  3. Step 3: Cross multiply
    278.28x = 383.94 × 208.44
  4. Step 4: Simplify right side
    278.28x = 80,028.45
  5. Step 5: Solve for x
    x = 80,028.45/278.28
  6. Step 6: Final answer
    x = 287.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.