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Finding the Fourth Proportional to 391.89, 540.79 and 226.11

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Solution

The fourth proportional to 391.89, 540.79 and 226.11 is: 312.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.89 : 540.79 = 226.11 : x
  2. Step 2: Convert to fraction form
    391.89/540.79 = 226.11/x
  3. Step 3: Cross multiply
    391.89x = 540.79 × 226.11
  4. Step 4: Simplify right side
    391.89x = 122,278.03
  5. Step 5: Solve for x
    x = 122,278.03/391.89
  6. Step 6: Final answer
    x = 312.02

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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.