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Finding the Fourth Proportional to 807.92, 1,211.88 and 321.08

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Solution

The fourth proportional to 807.92, 1,211.88 and 321.08 is: 481.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.92 : 1,211.88 = 321.08 : x
  2. Step 2: Convert to fraction form
    807.92/1,211.88 = 321.08/x
  3. Step 3: Cross multiply
    807.92x = 1,211.88 × 321.08
  4. Step 4: Simplify right side
    807.92x = 389,110.43
  5. Step 5: Solve for x
    x = 389,110.43/807.92
  6. Step 6: Final answer
    x = 481.62

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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.