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Finding the Fourth Proportional to 281.94, 388.96 and 203.55

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Solution

The fourth proportional to 281.94, 388.96 and 203.55 is: 280.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.94 : 388.96 = 203.55 : x
  2. Step 2: Convert to fraction form
    281.94/388.96 = 203.55/x
  3. Step 3: Cross multiply
    281.94x = 388.96 × 203.55
  4. Step 4: Simplify right side
    281.94x = 79,172.81
  5. Step 5: Solve for x
    x = 79,172.81/281.94
  6. Step 6: Final answer
    x = 280.81

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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.