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Finding the Fourth Proportional to 811.13, 1,217.01 and 324.23

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Solution

The fourth proportional to 811.13, 1,217.01 and 324.23 is: 486.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.13 : 1,217.01 = 324.23 : x
  2. Step 2: Convert to fraction form
    811.13/1,217.01 = 324.23/x
  3. Step 3: Cross multiply
    811.13x = 1,217.01 × 324.23
  4. Step 4: Simplify right side
    811.13x = 394,591.15
  5. Step 5: Solve for x
    x = 394,591.15/811.13
  6. Step 6: Final answer
    x = 486.47

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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.