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Finding the Fourth Proportional to 813.12, 1,122.20 and 481.54

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Solution

The fourth proportional to 813.12, 1,122.20 and 481.54 is: 664.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.12 : 1,122.20 = 481.54 : x
  2. Step 2: Convert to fraction form
    813.12/1,122.20 = 481.54/x
  3. Step 3: Cross multiply
    813.12x = 1,122.20 × 481.54
  4. Step 4: Simplify right side
    813.12x = 540,384.19
  5. Step 5: Solve for x
    x = 540,384.19/813.12
  6. Step 6: Final answer
    x = 664.58

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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.