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Finding the Fourth Proportional to 815.29, 1,220.09 and 667.33

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Solution

The fourth proportional to 815.29, 1,220.09 and 667.33 is: 998.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.29 : 1,220.09 = 667.33 : x
  2. Step 2: Convert to fraction form
    815.29/1,220.09 = 667.33/x
  3. Step 3: Cross multiply
    815.29x = 1,220.09 × 667.33
  4. Step 4: Simplify right side
    815.29x = 814,202.66
  5. Step 5: Solve for x
    x = 814,202.66/815.29
  6. Step 6: Final answer
    x = 998.67

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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.