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Finding the Fourth Proportional to 393.57, 543.47 and 289.25

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Solution

The fourth proportional to 393.57, 543.47 and 289.25 is: 399.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.57 : 543.47 = 289.25 : x
  2. Step 2: Convert to fraction form
    393.57/543.47 = 289.25/x
  3. Step 3: Cross multiply
    393.57x = 543.47 × 289.25
  4. Step 4: Simplify right side
    393.57x = 157,198.70
  5. Step 5: Solve for x
    x = 157,198.70/393.57
  6. Step 6: Final answer
    x = 399.42

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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.