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Finding the Fourth Proportional to 791.26, 1,186.71 and 243.45

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Solution

The fourth proportional to 791.26, 1,186.71 and 243.45 is: 365.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.26 : 1,186.71 = 243.45 : x
  2. Step 2: Convert to fraction form
    791.26/1,186.71 = 243.45/x
  3. Step 3: Cross multiply
    791.26x = 1,186.71 × 243.45
  4. Step 4: Simplify right side
    791.26x = 288,904.55
  5. Step 5: Solve for x
    x = 288,904.55/791.26
  6. Step 6: Final answer
    x = 365.12

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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.