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Finding the Fourth Proportional to 729.36, 1,092.09 and 419.63

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Solution

The fourth proportional to 729.36, 1,092.09 and 419.63 is: 628.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.36 : 1,092.09 = 419.63 : x
  2. Step 2: Convert to fraction form
    729.36/1,092.09 = 419.63/x
  3. Step 3: Cross multiply
    729.36x = 1,092.09 × 419.63
  4. Step 4: Simplify right side
    729.36x = 458,273.73
  5. Step 5: Solve for x
    x = 458,273.73/729.36
  6. Step 6: Final answer
    x = 628.32

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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.