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Finding the Fourth Proportional to 281.54, 421.95 and 127.42

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Solution

The fourth proportional to 281.54, 421.95 and 127.42 is: 190.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.54 : 421.95 = 127.42 : x
  2. Step 2: Convert to fraction form
    281.54/421.95 = 127.42/x
  3. Step 3: Cross multiply
    281.54x = 421.95 × 127.42
  4. Step 4: Simplify right side
    281.54x = 53,763.81
  5. Step 5: Solve for x
    x = 53,763.81/281.54
  6. Step 6: Final answer
    x = 190.97

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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.