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Finding the Fourth Proportional to 281.96, 389.40 and 251.42

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Solution

The fourth proportional to 281.96, 389.40 and 251.42 is: 347.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.96 : 389.40 = 251.42 : x
  2. Step 2: Convert to fraction form
    281.96/389.40 = 251.42/x
  3. Step 3: Cross multiply
    281.96x = 389.40 × 251.42
  4. Step 4: Simplify right side
    281.96x = 97,902.95
  5. Step 5: Solve for x
    x = 97,902.95/281.96
  6. Step 6: Final answer
    x = 347.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.