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Finding the Fourth Proportional to 799.50, 1,103.74 and 519.90

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Solution

The fourth proportional to 799.50, 1,103.74 and 519.90 is: 717.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.50 : 1,103.74 = 519.90 : x
  2. Step 2: Convert to fraction form
    799.50/1,103.74 = 519.90/x
  3. Step 3: Cross multiply
    799.50x = 1,103.74 × 519.90
  4. Step 4: Simplify right side
    799.50x = 573,838.12
  5. Step 5: Solve for x
    x = 573,838.12/799.50
  6. Step 6: Final answer
    x = 717.74

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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.