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Finding the Fourth Proportional to 755.72, 1,131.18 and 408.56

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Solution

The fourth proportional to 755.72, 1,131.18 and 408.56 is: 611.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.72 : 1,131.18 = 408.56 : x
  2. Step 2: Convert to fraction form
    755.72/1,131.18 = 408.56/x
  3. Step 3: Cross multiply
    755.72x = 1,131.18 × 408.56
  4. Step 4: Simplify right side
    755.72x = 462,154.90
  5. Step 5: Solve for x
    x = 462,154.90/755.72
  6. Step 6: Final answer
    x = 611.54

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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.