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Finding the Fourth Proportional to 851.28, 1,276.62 and 331.12

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Solution

The fourth proportional to 851.28, 1,276.62 and 331.12 is: 496.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.28 : 1,276.62 = 331.12 : x
  2. Step 2: Convert to fraction form
    851.28/1,276.62 = 331.12/x
  3. Step 3: Cross multiply
    851.28x = 1,276.62 × 331.12
  4. Step 4: Simplify right side
    851.28x = 422,714.41
  5. Step 5: Solve for x
    x = 422,714.41/851.28
  6. Step 6: Final answer
    x = 496.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.