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Finding the Fourth Proportional to 815.38, 1,223.06 and 199.09

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Solution

The fourth proportional to 815.38, 1,223.06 and 199.09 is: 298.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.38 : 1,223.06 = 199.09 : x
  2. Step 2: Convert to fraction form
    815.38/1,223.06 = 199.09/x
  3. Step 3: Cross multiply
    815.38x = 1,223.06 × 199.09
  4. Step 4: Simplify right side
    815.38x = 243,492.90
  5. Step 5: Solve for x
    x = 243,492.90/815.38
  6. Step 6: Final answer
    x = 298.63

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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.