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Finding the Fourth Proportional to 799.62, 1,200.81 and 720.36

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Solution

The fourth proportional to 799.62, 1,200.81 and 720.36 is: 1,081.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.62 : 1,200.81 = 720.36 : x
  2. Step 2: Convert to fraction form
    799.62/1,200.81 = 720.36/x
  3. Step 3: Cross multiply
    799.62x = 1,200.81 × 720.36
  4. Step 4: Simplify right side
    799.62x = 865,015.49
  5. Step 5: Solve for x
    x = 865,015.49/799.62
  6. Step 6: Final answer
    x = 1,081.78

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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.