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Finding the Fourth Proportional to 275.49, 379.91 and 216.38

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Solution

The fourth proportional to 275.49, 379.91 and 216.38 is: 298.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.49 : 379.91 = 216.38 : x
  2. Step 2: Convert to fraction form
    275.49/379.91 = 216.38/x
  3. Step 3: Cross multiply
    275.49x = 379.91 × 216.38
  4. Step 4: Simplify right side
    275.49x = 82,201.94
  5. Step 5: Solve for x
    x = 82,201.94/275.49
  6. Step 6: Final answer
    x = 298.38

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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.