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Finding the Fourth Proportional to 681.71, 1,022.90 and 674.15

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Solution

The fourth proportional to 681.71, 1,022.90 and 674.15 is: 1,011.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.71 : 1,022.90 = 674.15 : x
  2. Step 2: Convert to fraction form
    681.71/1,022.90 = 674.15/x
  3. Step 3: Cross multiply
    681.71x = 1,022.90 × 674.15
  4. Step 4: Simplify right side
    681.71x = 689,579.55
  5. Step 5: Solve for x
    x = 689,579.55/681.71
  6. Step 6: Final answer
    x = 1,011.55

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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.