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Finding the Fourth Proportional to 281.37, 421.96 and 86.33

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Solution

The fourth proportional to 281.37, 421.96 and 86.33 is: 129.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.37 : 421.96 = 86.33 : x
  2. Step 2: Convert to fraction form
    281.37/421.96 = 86.33/x
  3. Step 3: Cross multiply
    281.37x = 421.96 × 86.33
  4. Step 4: Simplify right side
    281.37x = 36,427.81
  5. Step 5: Solve for x
    x = 36,427.81/281.37
  6. Step 6: Final answer
    x = 129.47

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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.