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Finding the Fourth Proportional to 812.04, 1,217.34 and 426.12

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Solution

The fourth proportional to 812.04, 1,217.34 and 426.12 is: 638.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.04 : 1,217.34 = 426.12 : x
  2. Step 2: Convert to fraction form
    812.04/1,217.34 = 426.12/x
  3. Step 3: Cross multiply
    812.04x = 1,217.34 × 426.12
  4. Step 4: Simplify right side
    812.04x = 518,732.92
  5. Step 5: Solve for x
    x = 518,732.92/812.04
  6. Step 6: Final answer
    x = 638.80

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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.