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Finding the Fourth Proportional to 330.63, 455.46 and 256.82

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Solution

The fourth proportional to 330.63, 455.46 and 256.82 is: 353.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.63 : 455.46 = 256.82 : x
  2. Step 2: Convert to fraction form
    330.63/455.46 = 256.82/x
  3. Step 3: Cross multiply
    330.63x = 455.46 × 256.82
  4. Step 4: Simplify right side
    330.63x = 116,968.96
  5. Step 5: Solve for x
    x = 116,968.96/330.63
  6. Step 6: Final answer
    x = 353.78

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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.