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Finding the Fourth Proportional to 393.11, 542.57 and 227.36

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Solution

The fourth proportional to 393.11, 542.57 and 227.36 is: 313.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.11 : 542.57 = 227.36 : x
  2. Step 2: Convert to fraction form
    393.11/542.57 = 227.36/x
  3. Step 3: Cross multiply
    393.11x = 542.57 × 227.36
  4. Step 4: Simplify right side
    393.11x = 123,358.72
  5. Step 5: Solve for x
    x = 123,358.72/393.11
  6. Step 6: Final answer
    x = 313.80

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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.