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Finding the Fourth Proportional to 339.69, 465.78 and 331.49

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Solution

The fourth proportional to 339.69, 465.78 and 331.49 is: 454.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.69 : 465.78 = 331.49 : x
  2. Step 2: Convert to fraction form
    339.69/465.78 = 331.49/x
  3. Step 3: Cross multiply
    339.69x = 465.78 × 331.49
  4. Step 4: Simplify right side
    339.69x = 154,401.02
  5. Step 5: Solve for x
    x = 154,401.02/339.69
  6. Step 6: Final answer
    x = 454.53

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.