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Finding the Fourth Proportional to 343.80, 515 and 161.36

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Solution

The fourth proportional to 343.80, 515 and 161.36 is: 241.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.80 : 515 = 161.36 : x
  2. Step 2: Convert to fraction form
    343.80/515 = 161.36/x
  3. Step 3: Cross multiply
    343.80x = 515 × 161.36
  4. Step 4: Simplify right side
    343.80x = 83,100.40
  5. Step 5: Solve for x
    x = 83,100.40/343.80
  6. Step 6: Final answer
    x = 241.71

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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.