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Finding the Fourth Proportional to 339.20, 467.40 and 276.80

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Solution

The fourth proportional to 339.20, 467.40 and 276.80 is: 381.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.20 : 467.40 = 276.80 : x
  2. Step 2: Convert to fraction form
    339.20/467.40 = 276.80/x
  3. Step 3: Cross multiply
    339.20x = 467.40 × 276.80
  4. Step 4: Simplify right side
    339.20x = 129,376.32
  5. Step 5: Solve for x
    x = 129,376.32/339.20
  6. Step 6: Final answer
    x = 381.42

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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.