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Finding the Fourth Proportional to 813.20, 1,121.84 and 481.50

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Solution

The fourth proportional to 813.20, 1,121.84 and 481.50 is: 664.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.20 : 1,121.84 = 481.50 : x
  2. Step 2: Convert to fraction form
    813.20/1,121.84 = 481.50/x
  3. Step 3: Cross multiply
    813.20x = 1,121.84 × 481.50
  4. Step 4: Simplify right side
    813.20x = 540,165.96
  5. Step 5: Solve for x
    x = 540,165.96/813.20
  6. Step 6: Final answer
    x = 664.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.