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Finding the Fourth Proportional to 811.35, 1,217.25 and 324.41

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Solution

The fourth proportional to 811.35, 1,217.25 and 324.41 is: 486.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.35 : 1,217.25 = 324.41 : x
  2. Step 2: Convert to fraction form
    811.35/1,217.25 = 324.41/x
  3. Step 3: Cross multiply
    811.35x = 1,217.25 × 324.41
  4. Step 4: Simplify right side
    811.35x = 394,881.99
  5. Step 5: Solve for x
    x = 394,881.99/811.35
  6. Step 6: Final answer
    x = 486.70

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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.