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Finding the Fourth Proportional to 791.45, 1,092.11 and 455.40

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Solution

The fourth proportional to 791.45, 1,092.11 and 455.40 is: 628.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.45 : 1,092.11 = 455.40 : x
  2. Step 2: Convert to fraction form
    791.45/1,092.11 = 455.40/x
  3. Step 3: Cross multiply
    791.45x = 1,092.11 × 455.40
  4. Step 4: Simplify right side
    791.45x = 497,346.89
  5. Step 5: Solve for x
    x = 497,346.89/791.45
  6. Step 6: Final answer
    x = 628.40

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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.