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Finding the Fourth Proportional to 378.20, 566.46 and 215.78

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Solution

The fourth proportional to 378.20, 566.46 and 215.78 is: 323.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.20 : 566.46 = 215.78 : x
  2. Step 2: Convert to fraction form
    378.20/566.46 = 215.78/x
  3. Step 3: Cross multiply
    378.20x = 566.46 × 215.78
  4. Step 4: Simplify right side
    378.20x = 122,230.74
  5. Step 5: Solve for x
    x = 122,230.74/378.20
  6. Step 6: Final answer
    x = 323.19

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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.