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Finding the Fourth Proportional to 393.22, 542.64 and 227.43

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Solution

The fourth proportional to 393.22, 542.64 and 227.43 is: 313.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.22 : 542.64 = 227.43 : x
  2. Step 2: Convert to fraction form
    393.22/542.64 = 227.43/x
  3. Step 3: Cross multiply
    393.22x = 542.64 × 227.43
  4. Step 4: Simplify right side
    393.22x = 123,412.62
  5. Step 5: Solve for x
    x = 123,412.62/393.22
  6. Step 6: Final answer
    x = 313.85

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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.