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Finding the Fourth Proportional to 791.03, 1,189.15 and 561.57

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Solution

The fourth proportional to 791.03, 1,189.15 and 561.57 is: 844.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.03 : 1,189.15 = 561.57 : x
  2. Step 2: Convert to fraction form
    791.03/1,189.15 = 561.57/x
  3. Step 3: Cross multiply
    791.03x = 1,189.15 × 561.57
  4. Step 4: Simplify right side
    791.03x = 667,785.10
  5. Step 5: Solve for x
    x = 667,785.10/791.03
  6. Step 6: Final answer
    x = 844.19

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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.