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Finding the Fourth Proportional to 699.55, 1,049.15 and 205.85

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Solution

The fourth proportional to 699.55, 1,049.15 and 205.85 is: 308.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.55 : 1,049.15 = 205.85 : x
  2. Step 2: Convert to fraction form
    699.55/1,049.15 = 205.85/x
  3. Step 3: Cross multiply
    699.55x = 1,049.15 × 205.85
  4. Step 4: Simplify right side
    699.55x = 215,970.67
  5. Step 5: Solve for x
    x = 215,970.67/699.55
  6. Step 6: Final answer
    x = 308.73

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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.