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Finding the Fourth Proportional to 378.22, 567.36 and 215.86

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Solution

The fourth proportional to 378.22, 567.36 and 215.86 is: 323.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.22 : 567.36 = 215.86 : x
  2. Step 2: Convert to fraction form
    378.22/567.36 = 215.86/x
  3. Step 3: Cross multiply
    378.22x = 567.36 × 215.86
  4. Step 4: Simplify right side
    378.22x = 122,470.33
  5. Step 5: Solve for x
    x = 122,470.33/378.22
  6. Step 6: Final answer
    x = 323.81

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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.