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Finding the Fourth Proportional to 799.63, 1,198.35 and 387.95

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Solution

The fourth proportional to 799.63, 1,198.35 and 387.95 is: 581.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.63 : 1,198.35 = 387.95 : x
  2. Step 2: Convert to fraction form
    799.63/1,198.35 = 387.95/x
  3. Step 3: Cross multiply
    799.63x = 1,198.35 × 387.95
  4. Step 4: Simplify right side
    799.63x = 464,893.89
  5. Step 5: Solve for x
    x = 464,893.89/799.63
  6. Step 6: Final answer
    x = 581.39

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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.