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Finding the Fourth Proportional to 393.58, 543.14 and 227.78

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Solution

The fourth proportional to 393.58, 543.14 and 227.78 is: 314.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.58 : 543.14 = 227.78 : x
  2. Step 2: Convert to fraction form
    393.58/543.14 = 227.78/x
  3. Step 3: Cross multiply
    393.58x = 543.14 × 227.78
  4. Step 4: Simplify right side
    393.58x = 123,716.43
  5. Step 5: Solve for x
    x = 123,716.43/393.58
  6. Step 6: Final answer
    x = 314.34

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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.