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Finding the Fourth Proportional to 391.87, 540.91 and 226.13

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Solution

The fourth proportional to 391.87, 540.91 and 226.13 is: 312.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.87 : 540.91 = 226.13 : x
  2. Step 2: Convert to fraction form
    391.87/540.91 = 226.13/x
  3. Step 3: Cross multiply
    391.87x = 540.91 × 226.13
  4. Step 4: Simplify right side
    391.87x = 122,313.56
  5. Step 5: Solve for x
    x = 122,313.56/391.87
  6. Step 6: Final answer
    x = 312.13

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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.