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Finding the Fourth Proportional to 721.96, 1,081.50 and 548.92

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Solution

The fourth proportional to 721.96, 1,081.50 and 548.92 is: 822.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.96 : 1,081.50 = 548.92 : x
  2. Step 2: Convert to fraction form
    721.96/1,081.50 = 548.92/x
  3. Step 3: Cross multiply
    721.96x = 1,081.50 × 548.92
  4. Step 4: Simplify right side
    721.96x = 593,656.98
  5. Step 5: Solve for x
    x = 593,656.98/721.96
  6. Step 6: Final answer
    x = 822.29

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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.