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Finding the Fourth Proportional to 286.33, 394.91 and 216.40

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Solution

The fourth proportional to 286.33, 394.91 and 216.40 is: 298.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.33 : 394.91 = 216.40 : x
  2. Step 2: Convert to fraction form
    286.33/394.91 = 216.40/x
  3. Step 3: Cross multiply
    286.33x = 394.91 × 216.40
  4. Step 4: Simplify right side
    286.33x = 85,456.45
  5. Step 5: Solve for x
    x = 85,456.45/286.33
  6. Step 6: Final answer
    x = 298.46

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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.