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Finding the Fourth Proportional to 799.31, 1,198.97 and 312.48

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Solution

The fourth proportional to 799.31, 1,198.97 and 312.48 is: 468.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.31 : 1,198.97 = 312.48 : x
  2. Step 2: Convert to fraction form
    799.31/1,198.97 = 312.48/x
  3. Step 3: Cross multiply
    799.31x = 1,198.97 × 312.48
  4. Step 4: Simplify right side
    799.31x = 374,653.76
  5. Step 5: Solve for x
    x = 374,653.76/799.31
  6. Step 6: Final answer
    x = 468.72

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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.