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Finding the Fourth Proportional to 391.09, 539.84 and 225.37

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Solution

The fourth proportional to 391.09, 539.84 and 225.37 is: 311.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.09 : 539.84 = 225.37 : x
  2. Step 2: Convert to fraction form
    391.09/539.84 = 225.37/x
  3. Step 3: Cross multiply
    391.09x = 539.84 × 225.37
  4. Step 4: Simplify right side
    391.09x = 121,664.13
  5. Step 5: Solve for x
    x = 121,664.13/391.09
  6. Step 6: Final answer
    x = 311.09

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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.