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Finding the Fourth Proportional to 681.92, 1,022.20 and 317

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Solution

The fourth proportional to 681.92, 1,022.20 and 317 is: 475.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.92 : 1,022.20 = 317 : x
  2. Step 2: Convert to fraction form
    681.92/1,022.20 = 317/x
  3. Step 3: Cross multiply
    681.92x = 1,022.20 × 317
  4. Step 4: Simplify right side
    681.92x = 324,037.40
  5. Step 5: Solve for x
    x = 324,037.40/681.92
  6. Step 6: Final answer
    x = 475.18

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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.