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Finding the Fourth Proportional to 791.50, 1,092.20 and 442.20

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Solution

The fourth proportional to 791.50, 1,092.20 and 442.20 is: 610.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.50 : 1,092.20 = 442.20 : x
  2. Step 2: Convert to fraction form
    791.50/1,092.20 = 442.20/x
  3. Step 3: Cross multiply
    791.50x = 1,092.20 × 442.20
  4. Step 4: Simplify right side
    791.50x = 482,970.84
  5. Step 5: Solve for x
    x = 482,970.84/791.50
  6. Step 6: Final answer
    x = 610.20

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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.