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Finding the Fourth Proportional to 767.43, 1,149.31 and 420.25

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Solution

The fourth proportional to 767.43, 1,149.31 and 420.25 is: 629.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.43 : 1,149.31 = 420.25 : x
  2. Step 2: Convert to fraction form
    767.43/1,149.31 = 420.25/x
  3. Step 3: Cross multiply
    767.43x = 1,149.31 × 420.25
  4. Step 4: Simplify right side
    767.43x = 482,997.53
  5. Step 5: Solve for x
    x = 482,997.53/767.43
  6. Step 6: Final answer
    x = 629.37

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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.