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Finding the Fourth Proportional to 263.68, 397.85 and 255.31

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Solution

The fourth proportional to 263.68, 397.85 and 255.31 is: 385.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.68 : 397.85 = 255.31 : x
  2. Step 2: Convert to fraction form
    263.68/397.85 = 255.31/x
  3. Step 3: Cross multiply
    263.68x = 397.85 × 255.31
  4. Step 4: Simplify right side
    263.68x = 101,575.08
  5. Step 5: Solve for x
    x = 101,575.08/263.68
  6. Step 6: Final answer
    x = 385.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.