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Finding the Fourth Proportional to 812.57, 1,217.84 and 325.35

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Solution

The fourth proportional to 812.57, 1,217.84 and 325.35 is: 487.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.57 : 1,217.84 = 325.35 : x
  2. Step 2: Convert to fraction form
    812.57/1,217.84 = 325.35/x
  3. Step 3: Cross multiply
    812.57x = 1,217.84 × 325.35
  4. Step 4: Simplify right side
    812.57x = 396,222.62
  5. Step 5: Solve for x
    x = 396,222.62/812.57
  6. Step 6: Final answer
    x = 487.62

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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.