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Finding the Fourth Proportional to 391.27, 540.12 and 243.95

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Solution

The fourth proportional to 391.27, 540.12 and 243.95 is: 336.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.27 : 540.12 = 243.95 : x
  2. Step 2: Convert to fraction form
    391.27/540.12 = 243.95/x
  3. Step 3: Cross multiply
    391.27x = 540.12 × 243.95
  4. Step 4: Simplify right side
    391.27x = 131,763.62
  5. Step 5: Solve for x
    x = 131,763.62/391.27
  6. Step 6: Final answer
    x = 336.76

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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.