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Finding the Fourth Proportional to 751.57, 1,127.34 and 426.96

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Solution

The fourth proportional to 751.57, 1,127.34 and 426.96 is: 640.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.57 : 1,127.34 = 426.96 : x
  2. Step 2: Convert to fraction form
    751.57/1,127.34 = 426.96/x
  3. Step 3: Cross multiply
    751.57x = 1,127.34 × 426.96
  4. Step 4: Simplify right side
    751.57x = 481,329.09
  5. Step 5: Solve for x
    x = 481,329.09/751.57
  6. Step 6: Final answer
    x = 640.43

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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.