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Finding the Fourth Proportional to 815.27, 1,220.33 and 444.56

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Solution

The fourth proportional to 815.27, 1,220.33 and 444.56 is: 665.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.27 : 1,220.33 = 444.56 : x
  2. Step 2: Convert to fraction form
    815.27/1,220.33 = 444.56/x
  3. Step 3: Cross multiply
    815.27x = 1,220.33 × 444.56
  4. Step 4: Simplify right side
    815.27x = 542,501.58
  5. Step 5: Solve for x
    x = 542,501.58/815.27
  6. Step 6: Final answer
    x = 665.43

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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.