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Finding the Fourth Proportional to 391.11, 539.67 and 225.33

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Solution

The fourth proportional to 391.11, 539.67 and 225.33 is: 310.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.11 : 539.67 = 225.33 : x
  2. Step 2: Convert to fraction form
    391.11/539.67 = 225.33/x
  3. Step 3: Cross multiply
    391.11x = 539.67 × 225.33
  4. Step 4: Simplify right side
    391.11x = 121,603.84
  5. Step 5: Solve for x
    x = 121,603.84/391.11
  6. Step 6: Final answer
    x = 310.92

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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.