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Finding the Fourth Proportional to 286.65, 394.56 and 239.49

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Solution

The fourth proportional to 286.65, 394.56 and 239.49 is: 329.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.65 : 394.56 = 239.49 : x
  2. Step 2: Convert to fraction form
    286.65/394.56 = 239.49/x
  3. Step 3: Cross multiply
    286.65x = 394.56 × 239.49
  4. Step 4: Simplify right side
    286.65x = 94,493.17
  5. Step 5: Solve for x
    x = 94,493.17/286.65
  6. Step 6: Final answer
    x = 329.65

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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.