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Finding the Fourth Proportional to 393.76, 543.37 and 219.09

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Solution

The fourth proportional to 393.76, 543.37 and 219.09 is: 302.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.76 : 543.37 = 219.09 : x
  2. Step 2: Convert to fraction form
    393.76/543.37 = 219.09/x
  3. Step 3: Cross multiply
    393.76x = 543.37 × 219.09
  4. Step 4: Simplify right side
    393.76x = 119,048.70
  5. Step 5: Solve for x
    x = 119,048.70/393.76
  6. Step 6: Final answer
    x = 302.34

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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.