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Finding the Fourth Proportional to 281.36, 421.44 and 257.68

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Solution

The fourth proportional to 281.36, 421.44 and 257.68 is: 385.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.36 : 421.44 = 257.68 : x
  2. Step 2: Convert to fraction form
    281.36/421.44 = 257.68/x
  3. Step 3: Cross multiply
    281.36x = 421.44 × 257.68
  4. Step 4: Simplify right side
    281.36x = 108,596.66
  5. Step 5: Solve for x
    x = 108,596.66/281.36
  6. Step 6: Final answer
    x = 385.97

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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.