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Finding the Fourth Proportional to 391.14, 539.79 and 225.39

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Solution

The fourth proportional to 391.14, 539.79 and 225.39 is: 311.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.14 : 539.79 = 225.39 : x
  2. Step 2: Convert to fraction form
    391.14/539.79 = 225.39/x
  3. Step 3: Cross multiply
    391.14x = 539.79 × 225.39
  4. Step 4: Simplify right side
    391.14x = 121,663.27
  5. Step 5: Solve for x
    x = 121,663.27/391.14
  6. Step 6: Final answer
    x = 311.05

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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.