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Finding the Fourth Proportional to 281.12, 388.64 and 255.50

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Solution

The fourth proportional to 281.12, 388.64 and 255.50 is: 353.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.12 : 388.64 = 255.50 : x
  2. Step 2: Convert to fraction form
    281.12/388.64 = 255.50/x
  3. Step 3: Cross multiply
    281.12x = 388.64 × 255.50
  4. Step 4: Simplify right side
    281.12x = 99,297.52
  5. Step 5: Solve for x
    x = 99,297.52/281.12
  6. Step 6: Final answer
    x = 353.22

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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.