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Finding the Fourth Proportional to 826.63, 1,140.32 and 629.80

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Solution

The fourth proportional to 826.63, 1,140.32 and 629.80 is: 868.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.63 : 1,140.32 = 629.80 : x
  2. Step 2: Convert to fraction form
    826.63/1,140.32 = 629.80/x
  3. Step 3: Cross multiply
    826.63x = 1,140.32 × 629.80
  4. Step 4: Simplify right side
    826.63x = 718,170.39
  5. Step 5: Solve for x
    x = 718,170.39/826.63
  6. Step 6: Final answer
    x = 868.79

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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.