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Finding the Fourth Proportional to 816.83, 1,225.31 and 323.22

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Solution

The fourth proportional to 816.83, 1,225.31 and 323.22 is: 484.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.83 : 1,225.31 = 323.22 : x
  2. Step 2: Convert to fraction form
    816.83/1,225.31 = 323.22/x
  3. Step 3: Cross multiply
    816.83x = 1,225.31 × 323.22
  4. Step 4: Simplify right side
    816.83x = 396,044.70
  5. Step 5: Solve for x
    x = 396,044.70/816.83
  6. Step 6: Final answer
    x = 484.86

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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.