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Finding the Fourth Proportional to 330.28, 455.22 and 256.46

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Solution

The fourth proportional to 330.28, 455.22 and 256.46 is: 353.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.28 : 455.22 = 256.46 : x
  2. Step 2: Convert to fraction form
    330.28/455.22 = 256.46/x
  3. Step 3: Cross multiply
    330.28x = 455.22 × 256.46
  4. Step 4: Simplify right side
    330.28x = 116,743.45
  5. Step 5: Solve for x
    x = 116,743.45/330.28
  6. Step 6: Final answer
    x = 353.47

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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.