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Finding the Fourth Proportional to 379.54, 523.99 and 248.78

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Solution

The fourth proportional to 379.54, 523.99 and 248.78 is: 343.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.54 : 523.99 = 248.78 : x
  2. Step 2: Convert to fraction form
    379.54/523.99 = 248.78/x
  3. Step 3: Cross multiply
    379.54x = 523.99 × 248.78
  4. Step 4: Simplify right side
    379.54x = 130,356.08
  5. Step 5: Solve for x
    x = 130,356.08/379.54
  6. Step 6: Final answer
    x = 343.46

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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.