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Finding the Fourth Proportional to 378.24, 568.20 and 256.68

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Solution

The fourth proportional to 378.24, 568.20 and 256.68 is: 385.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.24 : 568.20 = 256.68 : x
  2. Step 2: Convert to fraction form
    378.24/568.20 = 256.68/x
  3. Step 3: Cross multiply
    378.24x = 568.20 × 256.68
  4. Step 4: Simplify right side
    378.24x = 145,845.58
  5. Step 5: Solve for x
    x = 145,845.58/378.24
  6. Step 6: Final answer
    x = 385.59

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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.