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Finding the Fourth Proportional to 791.39, 1,091.48 and 698.22

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Solution

The fourth proportional to 791.39, 1,091.48 and 698.22 is: 962.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.39 : 1,091.48 = 698.22 : x
  2. Step 2: Convert to fraction form
    791.39/1,091.48 = 698.22/x
  3. Step 3: Cross multiply
    791.39x = 1,091.48 × 698.22
  4. Step 4: Simplify right side
    791.39x = 762,089.67
  5. Step 5: Solve for x
    x = 762,089.67/791.39
  6. Step 6: Final answer
    x = 962.97

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Double scale
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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.