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Finding the Fourth Proportional to 393.94, 543.57 and 219.25

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Solution

The fourth proportional to 393.94, 543.57 and 219.25 is: 302.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.94 : 543.57 = 219.25 : x
  2. Step 2: Convert to fraction form
    393.94/543.57 = 219.25/x
  3. Step 3: Cross multiply
    393.94x = 543.57 × 219.25
  4. Step 4: Simplify right side
    393.94x = 119,177.72
  5. Step 5: Solve for x
    x = 119,177.72/393.94
  6. Step 6: Final answer
    x = 302.53

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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.