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Finding the Fourth Proportional to 343.39, 515.12 and 112.21

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Solution

The fourth proportional to 343.39, 515.12 and 112.21 is: 168.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.39 : 515.12 = 112.21 : x
  2. Step 2: Convert to fraction form
    343.39/515.12 = 112.21/x
  3. Step 3: Cross multiply
    343.39x = 515.12 × 112.21
  4. Step 4: Simplify right side
    343.39x = 57,801.62
  5. Step 5: Solve for x
    x = 57,801.62/343.39
  6. Step 6: Final answer
    x = 168.33

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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.