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Finding the Fourth Proportional to 290.75, 400.36 and 249.21

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Solution

The fourth proportional to 290.75, 400.36 and 249.21 is: 343.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.75 : 400.36 = 249.21 : x
  2. Step 2: Convert to fraction form
    290.75/400.36 = 249.21/x
  3. Step 3: Cross multiply
    290.75x = 400.36 × 249.21
  4. Step 4: Simplify right side
    290.75x = 99,770.47
  5. Step 5: Solve for x
    x = 99,770.47/290.75
  6. Step 6: Final answer
    x = 343.15

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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.