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Finding the Fourth Proportional to 811.97, 1,217.34 and 446.25

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Solution

The fourth proportional to 811.97, 1,217.34 and 446.25 is: 669.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.97 : 1,217.34 = 446.25 : x
  2. Step 2: Convert to fraction form
    811.97/1,217.34 = 446.25/x
  3. Step 3: Cross multiply
    811.97x = 1,217.34 × 446.25
  4. Step 4: Simplify right side
    811.97x = 543,237.98
  5. Step 5: Solve for x
    x = 543,237.98/811.97
  6. Step 6: Final answer
    x = 669.04

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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.