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Finding the Fourth Proportional to 393.87, 543.56 and 219.21

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Solution

The fourth proportional to 393.87, 543.56 and 219.21 is: 302.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.87 : 543.56 = 219.21 : x
  2. Step 2: Convert to fraction form
    393.87/543.56 = 219.21/x
  3. Step 3: Cross multiply
    393.87x = 543.56 × 219.21
  4. Step 4: Simplify right side
    393.87x = 119,153.79
  5. Step 5: Solve for x
    x = 119,153.79/393.87
  6. Step 6: Final answer
    x = 302.52

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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.