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Finding the Fourth Proportional to 791.77, 1,091.68 and 721.54

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Solution

The fourth proportional to 791.77, 1,091.68 and 721.54 is: 994.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.77 : 1,091.68 = 721.54 : x
  2. Step 2: Convert to fraction form
    791.77/1,091.68 = 721.54/x
  3. Step 3: Cross multiply
    791.77x = 1,091.68 × 721.54
  4. Step 4: Simplify right side
    791.77x = 787,690.79
  5. Step 5: Solve for x
    x = 787,690.79/791.77
  6. Step 6: Final answer
    x = 994.85

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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.