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Finding the Fourth Proportional to 791.51, 1,187.26 and 243.68

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Solution

The fourth proportional to 791.51, 1,187.26 and 243.68 is: 365.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.51 : 1,187.26 = 243.68 : x
  2. Step 2: Convert to fraction form
    791.51/1,187.26 = 243.68/x
  3. Step 3: Cross multiply
    791.51x = 1,187.26 × 243.68
  4. Step 4: Simplify right side
    791.51x = 289,304.97
  5. Step 5: Solve for x
    x = 289,304.97/791.51
  6. Step 6: Final answer
    x = 365.51

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Double scale
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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.