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Finding the Fourth Proportional to 611.45, 843.51 and 349.31

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Solution

The fourth proportional to 611.45, 843.51 and 349.31 is: 481.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.45 : 843.51 = 349.31 : x
  2. Step 2: Convert to fraction form
    611.45/843.51 = 349.31/x
  3. Step 3: Cross multiply
    611.45x = 843.51 × 349.31
  4. Step 4: Simplify right side
    611.45x = 294,649.90
  5. Step 5: Solve for x
    x = 294,649.90/611.45
  6. Step 6: Final answer
    x = 481.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.