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Finding the Fourth Proportional to 911.88, 1,368.10 and 326.87

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Solution

The fourth proportional to 911.88, 1,368.10 and 326.87 is: 490.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.88 : 1,368.10 = 326.87 : x
  2. Step 2: Convert to fraction form
    911.88/1,368.10 = 326.87/x
  3. Step 3: Cross multiply
    911.88x = 1,368.10 × 326.87
  4. Step 4: Simplify right side
    911.88x = 447,190.85
  5. Step 5: Solve for x
    x = 447,190.85/911.88
  6. Step 6: Final answer
    x = 490.41

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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.