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Finding the Fourth Proportional to 809.36, 1,213.12 and 484.96

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Solution

The fourth proportional to 809.36, 1,213.12 and 484.96 is: 726.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.36 : 1,213.12 = 484.96 : x
  2. Step 2: Convert to fraction form
    809.36/1,213.12 = 484.96/x
  3. Step 3: Cross multiply
    809.36x = 1,213.12 × 484.96
  4. Step 4: Simplify right side
    809.36x = 588,314.68
  5. Step 5: Solve for x
    x = 588,314.68/809.36
  6. Step 6: Final answer
    x = 726.89

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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.