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Finding the Fourth Proportional to 391.92, 540.90 and 226.14

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Solution

The fourth proportional to 391.92, 540.90 and 226.14 is: 312.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.92 : 540.90 = 226.14 : x
  2. Step 2: Convert to fraction form
    391.92/540.90 = 226.14/x
  3. Step 3: Cross multiply
    391.92x = 540.90 × 226.14
  4. Step 4: Simplify right side
    391.92x = 122,319.13
  5. Step 5: Solve for x
    x = 122,319.13/391.92
  6. Step 6: Final answer
    x = 312.10

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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.