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Finding the Fourth Proportional to 815.71, 1,223.57 and 199.42

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Solution

The fourth proportional to 815.71, 1,223.57 and 199.42 is: 299.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.71 : 1,223.57 = 199.42 : x
  2. Step 2: Convert to fraction form
    815.71/1,223.57 = 199.42/x
  3. Step 3: Cross multiply
    815.71x = 1,223.57 × 199.42
  4. Step 4: Simplify right side
    815.71x = 244,004.33
  5. Step 5: Solve for x
    x = 244,004.33/815.71
  6. Step 6: Final answer
    x = 299.13

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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.