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Finding the Fourth Proportional to 813.56, 1,220.52 and 380.48

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Solution

The fourth proportional to 813.56, 1,220.52 and 380.48 is: 570.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.56 : 1,220.52 = 380.48 : x
  2. Step 2: Convert to fraction form
    813.56/1,220.52 = 380.48/x
  3. Step 3: Cross multiply
    813.56x = 1,220.52 × 380.48
  4. Step 4: Simplify right side
    813.56x = 464,375.44
  5. Step 5: Solve for x
    x = 464,375.44/813.56
  6. Step 6: Final answer
    x = 570.80

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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.