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Finding the Fourth Proportional to 393.94, 543.45 and 289

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Solution

The fourth proportional to 393.94, 543.45 and 289 is: 398.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.94 : 543.45 = 289 : x
  2. Step 2: Convert to fraction form
    393.94/543.45 = 289/x
  3. Step 3: Cross multiply
    393.94x = 543.45 × 289
  4. Step 4: Simplify right side
    393.94x = 157,057.05
  5. Step 5: Solve for x
    x = 157,057.05/393.94
  6. Step 6: Final answer
    x = 398.68

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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.