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Finding the Fourth Proportional to 826.38, 1,139.97 and 629.55

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Solution

The fourth proportional to 826.38, 1,139.97 and 629.55 is: 868.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.38 : 1,139.97 = 629.55 : x
  2. Step 2: Convert to fraction form
    826.38/1,139.97 = 629.55/x
  3. Step 3: Cross multiply
    826.38x = 1,139.97 × 629.55
  4. Step 4: Simplify right side
    826.38x = 717,668.11
  5. Step 5: Solve for x
    x = 717,668.11/826.38
  6. Step 6: Final answer
    x = 868.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.