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Finding the Fourth Proportional to 281.41, 421.42 and 178.38

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Solution

The fourth proportional to 281.41, 421.42 and 178.38 is: 267.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.41 : 421.42 = 178.38 : x
  2. Step 2: Convert to fraction form
    281.41/421.42 = 178.38/x
  3. Step 3: Cross multiply
    281.41x = 421.42 × 178.38
  4. Step 4: Simplify right side
    281.41x = 75,172.90
  5. Step 5: Solve for x
    x = 75,172.90/281.41
  6. Step 6: Final answer
    x = 267.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.