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Finding the Fourth Proportional to 281.19, 421.54 and 107.76

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Solution

The fourth proportional to 281.19, 421.54 and 107.76 is: 161.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.19 : 421.54 = 107.76 : x
  2. Step 2: Convert to fraction form
    281.19/421.54 = 107.76/x
  3. Step 3: Cross multiply
    281.19x = 421.54 × 107.76
  4. Step 4: Simplify right side
    281.19x = 45,425.15
  5. Step 5: Solve for x
    x = 45,425.15/281.19
  6. Step 6: Final answer
    x = 161.55

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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.