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Finding the Fourth Proportional to 811.36, 1,216.98 and 324.10

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Solution

The fourth proportional to 811.36, 1,216.98 and 324.10 is: 486.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.36 : 1,216.98 = 324.10 : x
  2. Step 2: Convert to fraction form
    811.36/1,216.98 = 324.10/x
  3. Step 3: Cross multiply
    811.36x = 1,216.98 × 324.10
  4. Step 4: Simplify right side
    811.36x = 394,423.22
  5. Step 5: Solve for x
    x = 394,423.22/811.36
  6. Step 6: Final answer
    x = 486.13

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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.