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Finding the Fourth Proportional to 378.78, 523.26 and 300.60

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Solution

The fourth proportional to 378.78, 523.26 and 300.60 is: 415.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.78 : 523.26 = 300.60 : x
  2. Step 2: Convert to fraction form
    378.78/523.26 = 300.60/x
  3. Step 3: Cross multiply
    378.78x = 523.26 × 300.60
  4. Step 4: Simplify right side
    378.78x = 157,291.96
  5. Step 5: Solve for x
    x = 157,291.96/378.78
  6. Step 6: Final answer
    x = 415.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.