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Finding the Fourth Proportional to 281.45, 421.79 and 127.49

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Solution

The fourth proportional to 281.45, 421.79 and 127.49 is: 191.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.45 : 421.79 = 127.49 : x
  2. Step 2: Convert to fraction form
    281.45/421.79 = 127.49/x
  3. Step 3: Cross multiply
    281.45x = 421.79 × 127.49
  4. Step 4: Simplify right side
    281.45x = 53,771.26
  5. Step 5: Solve for x
    x = 53,771.26/281.45
  6. Step 6: Final answer
    x = 191.05

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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.