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Finding the Fourth Proportional to 578.89, 867.74 and 213.42

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Solution

The fourth proportional to 578.89, 867.74 and 213.42 is: 319.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.89 : 867.74 = 213.42 : x
  2. Step 2: Convert to fraction form
    578.89/867.74 = 213.42/x
  3. Step 3: Cross multiply
    578.89x = 867.74 × 213.42
  4. Step 4: Simplify right side
    578.89x = 185,193.07
  5. Step 5: Solve for x
    x = 185,193.07/578.89
  6. Step 6: Final answer
    x = 319.91

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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.