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Finding the Fourth Proportional to 391.87, 540.80 and 223.87

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Solution

The fourth proportional to 391.87, 540.80 and 223.87 is: 308.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.87 : 540.80 = 223.87 : x
  2. Step 2: Convert to fraction form
    391.87/540.80 = 223.87/x
  3. Step 3: Cross multiply
    391.87x = 540.80 × 223.87
  4. Step 4: Simplify right side
    391.87x = 121,067.26
  5. Step 5: Solve for x
    x = 121,067.26/391.87
  6. Step 6: Final answer
    x = 308.95

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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.