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Finding the Fourth Proportional to 799.78, 1,103.70 and 445.70

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Solution

The fourth proportional to 799.78, 1,103.70 and 445.70 is: 615.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.78 : 1,103.70 = 445.70 : x
  2. Step 2: Convert to fraction form
    799.78/1,103.70 = 445.70/x
  3. Step 3: Cross multiply
    799.78x = 1,103.70 × 445.70
  4. Step 4: Simplify right side
    799.78x = 491,919.09
  5. Step 5: Solve for x
    x = 491,919.09/799.78
  6. Step 6: Final answer
    x = 615.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.