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Finding the Fourth Proportional to 818.92, 1,228.36 and 331.84

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Solution

The fourth proportional to 818.92, 1,228.36 and 331.84 is: 497.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.92 : 1,228.36 = 331.84 : x
  2. Step 2: Convert to fraction form
    818.92/1,228.36 = 331.84/x
  3. Step 3: Cross multiply
    818.92x = 1,228.36 × 331.84
  4. Step 4: Simplify right side
    818.92x = 407,618.98
  5. Step 5: Solve for x
    x = 407,618.98/818.92
  6. Step 6: Final answer
    x = 497.75

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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.