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Finding the Fourth Proportional to 281.39, 421.23 and 178.33

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Solution

The fourth proportional to 281.39, 421.23 and 178.33 is: 266.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.39 : 421.23 = 178.33 : x
  2. Step 2: Convert to fraction form
    281.39/421.23 = 178.33/x
  3. Step 3: Cross multiply
    281.39x = 421.23 × 178.33
  4. Step 4: Simplify right side
    281.39x = 75,117.95
  5. Step 5: Solve for x
    x = 75,117.95/281.39
  6. Step 6: Final answer
    x = 266.95

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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.