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Finding the Fourth Proportional to 818.61, 1,228.06 and 270.79

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Solution

The fourth proportional to 818.61, 1,228.06 and 270.79 is: 406.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.61 : 1,228.06 = 270.79 : x
  2. Step 2: Convert to fraction form
    818.61/1,228.06 = 270.79/x
  3. Step 3: Cross multiply
    818.61x = 1,228.06 × 270.79
  4. Step 4: Simplify right side
    818.61x = 332,550.54
  5. Step 5: Solve for x
    x = 332,550.54/818.61
  6. Step 6: Final answer
    x = 406.24

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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.