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Finding the Fourth Proportional to 252.90, 379.48 and 218.88

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Solution

The fourth proportional to 252.90, 379.48 and 218.88 is: 328.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.90 : 379.48 = 218.88 : x
  2. Step 2: Convert to fraction form
    252.90/379.48 = 218.88/x
  3. Step 3: Cross multiply
    252.90x = 379.48 × 218.88
  4. Step 4: Simplify right side
    252.90x = 83,060.58
  5. Step 5: Solve for x
    x = 83,060.58/252.90
  6. Step 6: Final answer
    x = 328.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.