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Finding the Fourth Proportional to 281.31, 421.98 and 144.31

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Solution

The fourth proportional to 281.31, 421.98 and 144.31 is: 216.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.31 : 421.98 = 144.31 : x
  2. Step 2: Convert to fraction form
    281.31/421.98 = 144.31/x
  3. Step 3: Cross multiply
    281.31x = 421.98 × 144.31
  4. Step 4: Simplify right side
    281.31x = 60,895.93
  5. Step 5: Solve for x
    x = 60,895.93/281.31
  6. Step 6: Final answer
    x = 216.47

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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.