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Finding the Fourth Proportional to 811.82, 1,217.73 and 445.80

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Solution

The fourth proportional to 811.82, 1,217.73 and 445.80 is: 668.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.82 : 1,217.73 = 445.80 : x
  2. Step 2: Convert to fraction form
    811.82/1,217.73 = 445.80/x
  3. Step 3: Cross multiply
    811.82x = 1,217.73 × 445.80
  4. Step 4: Simplify right side
    811.82x = 542,870.27
  5. Step 5: Solve for x
    x = 542,870.27/811.82
  6. Step 6: Final answer
    x = 668.71

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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.