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Finding the Fourth Proportional to 281.22, 421.72 and 107.80

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Solution

The fourth proportional to 281.22, 421.72 and 107.80 is: 161.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.22 : 421.72 = 107.80 : x
  2. Step 2: Convert to fraction form
    281.22/421.72 = 107.80/x
  3. Step 3: Cross multiply
    281.22x = 421.72 × 107.80
  4. Step 4: Simplify right side
    281.22x = 45,460.09
  5. Step 5: Solve for x
    x = 45,460.09/281.22
  6. Step 6: Final answer
    x = 161.66

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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.