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Finding the Fourth Proportional to 806.22, 1,209.78 and 319.62

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Solution

The fourth proportional to 806.22, 1,209.78 and 319.62 is: 479.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.22 : 1,209.78 = 319.62 : x
  2. Step 2: Convert to fraction form
    806.22/1,209.78 = 319.62/x
  3. Step 3: Cross multiply
    806.22x = 1,209.78 × 319.62
  4. Step 4: Simplify right side
    806.22x = 386,669.88
  5. Step 5: Solve for x
    x = 386,669.88/806.22
  6. Step 6: Final answer
    x = 479.61

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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.