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Finding the Fourth Proportional to 275.20, 379.80 and 216.88

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Solution

The fourth proportional to 275.20, 379.80 and 216.88 is: 299.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.20 : 379.80 = 216.88 : x
  2. Step 2: Convert to fraction form
    275.20/379.80 = 216.88/x
  3. Step 3: Cross multiply
    275.20x = 379.80 × 216.88
  4. Step 4: Simplify right side
    275.20x = 82,370.07
  5. Step 5: Solve for x
    x = 82,370.07/275.20
  6. Step 6: Final answer
    x = 299.31

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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.