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Finding the Fourth Proportional to 681.80, 1,022.69 and 168.80

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Solution

The fourth proportional to 681.80, 1,022.69 and 168.80 is: 253.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.80 : 1,022.69 = 168.80 : x
  2. Step 2: Convert to fraction form
    681.80/1,022.69 = 168.80/x
  3. Step 3: Cross multiply
    681.80x = 1,022.69 × 168.80
  4. Step 4: Simplify right side
    681.80x = 172,633.05
  5. Step 5: Solve for x
    x = 172,633.05/681.80
  6. Step 6: Final answer
    x = 253.20

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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.