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Finding the Fourth Proportional to 388.43, 535.66 and 255.41

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Solution

The fourth proportional to 388.43, 535.66 and 255.41 is: 352.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.43 : 535.66 = 255.41 : x
  2. Step 2: Convert to fraction form
    388.43/535.66 = 255.41/x
  3. Step 3: Cross multiply
    388.43x = 535.66 × 255.41
  4. Step 4: Simplify right side
    388.43x = 136,813.62
  5. Step 5: Solve for x
    x = 136,813.62/388.43
  6. Step 6: Final answer
    x = 352.23

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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.