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Finding the Fourth Proportional to 818.75, 1,228.11 and 270.77

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Solution

The fourth proportional to 818.75, 1,228.11 and 270.77 is: 406.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.75 : 1,228.11 = 270.77 : x
  2. Step 2: Convert to fraction form
    818.75/1,228.11 = 270.77/x
  3. Step 3: Cross multiply
    818.75x = 1,228.11 × 270.77
  4. Step 4: Simplify right side
    818.75x = 332,535.34
  5. Step 5: Solve for x
    x = 332,535.34/818.75
  6. Step 6: Final answer
    x = 406.15

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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.