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Finding the Fourth Proportional to 629.15, 939.48 and 513.82

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Solution

The fourth proportional to 629.15, 939.48 and 513.82 is: 767.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.15 : 939.48 = 513.82 : x
  2. Step 2: Convert to fraction form
    629.15/939.48 = 513.82/x
  3. Step 3: Cross multiply
    629.15x = 939.48 × 513.82
  4. Step 4: Simplify right side
    629.15x = 482,727.20
  5. Step 5: Solve for x
    x = 482,727.20/629.15
  6. Step 6: Final answer
    x = 767.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.