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Finding the Fourth Proportional to 330.38, 456.20 and 289.41

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Solution

The fourth proportional to 330.38, 456.20 and 289.41 is: 399.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.38 : 456.20 = 289.41 : x
  2. Step 2: Convert to fraction form
    330.38/456.20 = 289.41/x
  3. Step 3: Cross multiply
    330.38x = 456.20 × 289.41
  4. Step 4: Simplify right side
    330.38x = 132,027.39
  5. Step 5: Solve for x
    x = 132,027.39/330.38
  6. Step 6: Final answer
    x = 399.63

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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.