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Finding the Fourth Proportional to 756.09, 1,134.38 and 323.28

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Solution

The fourth proportional to 756.09, 1,134.38 and 323.28 is: 485.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.09 : 1,134.38 = 323.28 : x
  2. Step 2: Convert to fraction form
    756.09/1,134.38 = 323.28/x
  3. Step 3: Cross multiply
    756.09x = 1,134.38 × 323.28
  4. Step 4: Simplify right side
    756.09x = 366,720.75
  5. Step 5: Solve for x
    x = 366,720.75/756.09
  6. Step 6: Final answer
    x = 485.02

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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.