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Finding the Fourth Proportional to 911.97, 1,255.41 and 792.30

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Solution

The fourth proportional to 911.97, 1,255.41 and 792.30 is: 1,090.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.97 : 1,255.41 = 792.30 : x
  2. Step 2: Convert to fraction form
    911.97/1,255.41 = 792.30/x
  3. Step 3: Cross multiply
    911.97x = 1,255.41 × 792.30
  4. Step 4: Simplify right side
    911.97x = 994,661.34
  5. Step 5: Solve for x
    x = 994,661.34/911.97
  6. Step 6: Final answer
    x = 1,090.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.