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Finding the Fourth Proportional to 281.26, 387.12 and 239.68

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Solution

The fourth proportional to 281.26, 387.12 and 239.68 is: 329.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.26 : 387.12 = 239.68 : x
  2. Step 2: Convert to fraction form
    281.26/387.12 = 239.68/x
  3. Step 3: Cross multiply
    281.26x = 387.12 × 239.68
  4. Step 4: Simplify right side
    281.26x = 92,784.92
  5. Step 5: Solve for x
    x = 92,784.92/281.26
  6. Step 6: Final answer
    x = 329.89

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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.