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Finding the Fourth Proportional to 755.11, 1,133.10 and 408.45

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Solution

The fourth proportional to 755.11, 1,133.10 and 408.45 is: 612.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.11 : 1,133.10 = 408.45 : x
  2. Step 2: Convert to fraction form
    755.11/1,133.10 = 408.45/x
  3. Step 3: Cross multiply
    755.11x = 1,133.10 × 408.45
  4. Step 4: Simplify right side
    755.11x = 462,814.70
  5. Step 5: Solve for x
    x = 462,814.70/755.11
  6. Step 6: Final answer
    x = 612.91

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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.