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Finding the Fourth Proportional to 393.69, 543.29 and 223.34

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Solution

The fourth proportional to 393.69, 543.29 and 223.34 is: 308.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.69 : 543.29 = 223.34 : x
  2. Step 2: Convert to fraction form
    393.69/543.29 = 223.34/x
  3. Step 3: Cross multiply
    393.69x = 543.29 × 223.34
  4. Step 4: Simplify right side
    393.69x = 121,334.56
  5. Step 5: Solve for x
    x = 121,334.56/393.69
  6. Step 6: Final answer
    x = 308.20

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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.