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Finding the Fourth Proportional to 393.97, 543.70 and 219.31

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Solution

The fourth proportional to 393.97, 543.70 and 219.31 is: 302.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.97 : 543.70 = 219.31 : x
  2. Step 2: Convert to fraction form
    393.97/543.70 = 219.31/x
  3. Step 3: Cross multiply
    393.97x = 543.70 × 219.31
  4. Step 4: Simplify right side
    393.97x = 119,239.11
  5. Step 5: Solve for x
    x = 119,239.11/393.97
  6. Step 6: Final answer
    x = 302.66

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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.