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Finding the Fourth Proportional to 811.90, 1,217.94 and 324.94

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Solution

The fourth proportional to 811.90, 1,217.94 and 324.94 is: 487.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.90 : 1,217.94 = 324.94 : x
  2. Step 2: Convert to fraction form
    811.90/1,217.94 = 324.94/x
  3. Step 3: Cross multiply
    811.90x = 1,217.94 × 324.94
  4. Step 4: Simplify right side
    811.90x = 395,757.42
  5. Step 5: Solve for x
    x = 395,757.42/811.90
  6. Step 6: Final answer
    x = 487.45

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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.