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Finding the Fourth Proportional to 791.19, 1,186.40 and 243.22

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Solution

The fourth proportional to 791.19, 1,186.40 and 243.22 is: 364.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.19 : 1,186.40 = 243.22 : x
  2. Step 2: Convert to fraction form
    791.19/1,186.40 = 243.22/x
  3. Step 3: Cross multiply
    791.19x = 1,186.40 × 243.22
  4. Step 4: Simplify right side
    791.19x = 288,556.21
  5. Step 5: Solve for x
    x = 288,556.21/791.19
  6. Step 6: Final answer
    x = 364.71

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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.