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Finding the Fourth Proportional to 281.19, 387.74 and 239.69

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Solution

The fourth proportional to 281.19, 387.74 and 239.69 is: 330.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.19 : 387.74 = 239.69 : x
  2. Step 2: Convert to fraction form
    281.19/387.74 = 239.69/x
  3. Step 3: Cross multiply
    281.19x = 387.74 × 239.69
  4. Step 4: Simplify right side
    281.19x = 92,934.26
  5. Step 5: Solve for x
    x = 92,934.26/281.19
  6. Step 6: Final answer
    x = 330.50

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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.