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Finding the Fourth Proportional to 815.85, 1,223.75 and 199.56

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Solution

The fourth proportional to 815.85, 1,223.75 and 199.56 is: 299.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.85 : 1,223.75 = 199.56 : x
  2. Step 2: Convert to fraction form
    815.85/1,223.75 = 199.56/x
  3. Step 3: Cross multiply
    815.85x = 1,223.75 × 199.56
  4. Step 4: Simplify right side
    815.85x = 244,211.55
  5. Step 5: Solve for x
    x = 244,211.55/815.85
  6. Step 6: Final answer
    x = 299.33

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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.