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Finding the Fourth Proportional to 817.74, 1,226.79 and 331.20

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Solution

The fourth proportional to 817.74, 1,226.79 and 331.20 is: 496.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.74 : 1,226.79 = 331.20 : x
  2. Step 2: Convert to fraction form
    817.74/1,226.79 = 331.20/x
  3. Step 3: Cross multiply
    817.74x = 1,226.79 × 331.20
  4. Step 4: Simplify right side
    817.74x = 406,312.85
  5. Step 5: Solve for x
    x = 406,312.85/817.74
  6. Step 6: Final answer
    x = 496.87

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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.