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Finding the Fourth Proportional to 791.22, 1,090.26 and 712.38

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Solution

The fourth proportional to 791.22, 1,090.26 and 712.38 is: 981.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.22 : 1,090.26 = 712.38 : x
  2. Step 2: Convert to fraction form
    791.22/1,090.26 = 712.38/x
  3. Step 3: Cross multiply
    791.22x = 1,090.26 × 712.38
  4. Step 4: Simplify right side
    791.22x = 776,679.42
  5. Step 5: Solve for x
    x = 776,679.42/791.22
  6. Step 6: Final answer
    x = 981.62

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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.