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Finding the Fourth Proportional to 799.70, 1,199.55 and 415.22

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Solution

The fourth proportional to 799.70, 1,199.55 and 415.22 is: 622.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.70 : 1,199.55 = 415.22 : x
  2. Step 2: Convert to fraction form
    799.70/1,199.55 = 415.22/x
  3. Step 3: Cross multiply
    799.70x = 1,199.55 × 415.22
  4. Step 4: Simplify right side
    799.70x = 498,077.15
  5. Step 5: Solve for x
    x = 498,077.15/799.70
  6. Step 6: Final answer
    x = 622.83

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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.