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Finding the Fourth Proportional to 281.26, 421.68 and 144.16

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Solution

The fourth proportional to 281.26, 421.68 and 144.16 is: 216.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.26 : 421.68 = 144.16 : x
  2. Step 2: Convert to fraction form
    281.26/421.68 = 144.16/x
  3. Step 3: Cross multiply
    281.26x = 421.68 × 144.16
  4. Step 4: Simplify right side
    281.26x = 60,789.39
  5. Step 5: Solve for x
    x = 60,789.39/281.26
  6. Step 6: Final answer
    x = 216.13

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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.