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Finding the Fourth Proportional to 393.84, 591 and 249.84

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Solution

The fourth proportional to 393.84, 591 and 249.84 is: 374.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.84 : 591 = 249.84 : x
  2. Step 2: Convert to fraction form
    393.84/591 = 249.84/x
  3. Step 3: Cross multiply
    393.84x = 591 × 249.84
  4. Step 4: Simplify right side
    393.84x = 147,655.44
  5. Step 5: Solve for x
    x = 147,655.44/393.84
  6. Step 6: Final answer
    x = 374.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.