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Finding the Fourth Proportional to 826.88, 1,138.32 and 721.85

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Solution

The fourth proportional to 826.88, 1,138.32 and 721.85 is: 993.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.88 : 1,138.32 = 721.85 : x
  2. Step 2: Convert to fraction form
    826.88/1,138.32 = 721.85/x
  3. Step 3: Cross multiply
    826.88x = 1,138.32 × 721.85
  4. Step 4: Simplify right side
    826.88x = 821,690.60
  5. Step 5: Solve for x
    x = 821,690.60/826.88
  6. Step 6: Final answer
    x = 993.73

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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.