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Finding the Fourth Proportional to 818.78, 1,228.26 and 270.97

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Solution

The fourth proportional to 818.78, 1,228.26 and 270.97 is: 406.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.78 : 1,228.26 = 270.97 : x
  2. Step 2: Convert to fraction form
    818.78/1,228.26 = 270.97/x
  3. Step 3: Cross multiply
    818.78x = 1,228.26 × 270.97
  4. Step 4: Simplify right side
    818.78x = 332,821.61
  5. Step 5: Solve for x
    x = 332,821.61/818.78
  6. Step 6: Final answer
    x = 406.48

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Double scale
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1.5x scale

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.