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Finding the Fourth Proportional to 809.20, 1,116.75 and 459.91

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Solution

The fourth proportional to 809.20, 1,116.75 and 459.91 is: 634.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.20 : 1,116.75 = 459.91 : x
  2. Step 2: Convert to fraction form
    809.20/1,116.75 = 459.91/x
  3. Step 3: Cross multiply
    809.20x = 1,116.75 × 459.91
  4. Step 4: Simplify right side
    809.20x = 513,604.49
  5. Step 5: Solve for x
    x = 513,604.49/809.20
  6. Step 6: Final answer
    x = 634.71

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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.