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Finding the Fourth Proportional to 799.88, 1,199.81 and 331.55

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Solution

The fourth proportional to 799.88, 1,199.81 and 331.55 is: 497.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.88 : 1,199.81 = 331.55 : x
  2. Step 2: Convert to fraction form
    799.88/1,199.81 = 331.55/x
  3. Step 3: Cross multiply
    799.88x = 1,199.81 × 331.55
  4. Step 4: Simplify right side
    799.88x = 397,798.35
  5. Step 5: Solve for x
    x = 397,798.35/799.88
  6. Step 6: Final answer
    x = 497.32

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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.