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Finding the Fourth Proportional to 391.05, 539.69 and 225.22

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Solution

The fourth proportional to 391.05, 539.69 and 225.22 is: 310.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.05 : 539.69 = 225.22 : x
  2. Step 2: Convert to fraction form
    391.05/539.69 = 225.22/x
  3. Step 3: Cross multiply
    391.05x = 539.69 × 225.22
  4. Step 4: Simplify right side
    391.05x = 121,548.98
  5. Step 5: Solve for x
    x = 121,548.98/391.05
  6. Step 6: Final answer
    x = 310.83

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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.