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Finding the Fourth Proportional to 728.14, 1,092.22 and 405.54

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Solution

The fourth proportional to 728.14, 1,092.22 and 405.54 is: 608.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.14 : 1,092.22 = 405.54 : x
  2. Step 2: Convert to fraction form
    728.14/1,092.22 = 405.54/x
  3. Step 3: Cross multiply
    728.14x = 1,092.22 × 405.54
  4. Step 4: Simplify right side
    728.14x = 442,938.90
  5. Step 5: Solve for x
    x = 442,938.90/728.14
  6. Step 6: Final answer
    x = 608.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.