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Finding the Fourth Proportional to 799.55, 1,103.55 and 505.21

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Solution

The fourth proportional to 799.55, 1,103.55 and 505.21 is: 697.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.55 : 1,103.55 = 505.21 : x
  2. Step 2: Convert to fraction form
    799.55/1,103.55 = 505.21/x
  3. Step 3: Cross multiply
    799.55x = 1,103.55 × 505.21
  4. Step 4: Simplify right side
    799.55x = 557,524.50
  5. Step 5: Solve for x
    x = 557,524.50/799.55
  6. Step 6: Final answer
    x = 697.30

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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.