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Finding the Fourth Proportional to 330.31, 455.93 and 213.88

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Solution

The fourth proportional to 330.31, 455.93 and 213.88 is: 295.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.31 : 455.93 = 213.88 : x
  2. Step 2: Convert to fraction form
    330.31/455.93 = 213.88/x
  3. Step 3: Cross multiply
    330.31x = 455.93 × 213.88
  4. Step 4: Simplify right side
    330.31x = 97,514.31
  5. Step 5: Solve for x
    x = 97,514.31/330.31
  6. Step 6: Final answer
    x = 295.22

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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.