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Finding the Fourth Proportional to 263.19, 391.24 and 255.42

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Solution

The fourth proportional to 263.19, 391.24 and 255.42 is: 379.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.19 : 391.24 = 255.42 : x
  2. Step 2: Convert to fraction form
    263.19/391.24 = 255.42/x
  3. Step 3: Cross multiply
    263.19x = 391.24 × 255.42
  4. Step 4: Simplify right side
    263.19x = 99,930.52
  5. Step 5: Solve for x
    x = 99,930.52/263.19
  6. Step 6: Final answer
    x = 379.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.