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Finding the Fourth Proportional to 791.14, 1,092.72 and 644.35

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Solution

The fourth proportional to 791.14, 1,092.72 and 644.35 is: 889.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.14 : 1,092.72 = 644.35 : x
  2. Step 2: Convert to fraction form
    791.14/1,092.72 = 644.35/x
  3. Step 3: Cross multiply
    791.14x = 1,092.72 × 644.35
  4. Step 4: Simplify right side
    791.14x = 704,094.13
  5. Step 5: Solve for x
    x = 704,094.13/791.14
  6. Step 6: Final answer
    x = 889.97

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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.