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Finding the Fourth Proportional to 818.72, 1,228.12 and 270.86

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Solution

The fourth proportional to 818.72, 1,228.12 and 270.86 is: 406.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.72 : 1,228.12 = 270.86 : x
  2. Step 2: Convert to fraction form
    818.72/1,228.12 = 270.86/x
  3. Step 3: Cross multiply
    818.72x = 1,228.12 × 270.86
  4. Step 4: Simplify right side
    818.72x = 332,650.98
  5. Step 5: Solve for x
    x = 332,650.98/818.72
  6. Step 6: Final answer
    x = 406.31

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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.