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Finding the Fourth Proportional to 330.38, 455.64 and 199.30

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Solution

The fourth proportional to 330.38, 455.64 and 199.30 is: 274.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.38 : 455.64 = 199.30 : x
  2. Step 2: Convert to fraction form
    330.38/455.64 = 199.30/x
  3. Step 3: Cross multiply
    330.38x = 455.64 × 199.30
  4. Step 4: Simplify right side
    330.38x = 90,809.05
  5. Step 5: Solve for x
    x = 90,809.05/330.38
  6. Step 6: Final answer
    x = 274.86

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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.