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Finding the Fourth Proportional to 753.96, 1,131.41 and 321.11

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Solution

The fourth proportional to 753.96, 1,131.41 and 321.11 is: 481.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.96 : 1,131.41 = 321.11 : x
  2. Step 2: Convert to fraction form
    753.96/1,131.41 = 321.11/x
  3. Step 3: Cross multiply
    753.96x = 1,131.41 × 321.11
  4. Step 4: Simplify right side
    753.96x = 363,307.07
  5. Step 5: Solve for x
    x = 363,307.07/753.96
  6. Step 6: Final answer
    x = 481.87

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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.