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Finding the Fourth Proportional to 578.31, 867.39 and 213.05

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Solution

The fourth proportional to 578.31, 867.39 and 213.05 is: 319.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.31 : 867.39 = 213.05 : x
  2. Step 2: Convert to fraction form
    578.31/867.39 = 213.05/x
  3. Step 3: Cross multiply
    578.31x = 867.39 × 213.05
  4. Step 4: Simplify right side
    578.31x = 184,797.44
  5. Step 5: Solve for x
    x = 184,797.44/578.31
  6. Step 6: Final answer
    x = 319.55

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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.