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Finding the Fourth Proportional to 290.09, 399.90 and 196.68

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Solution

The fourth proportional to 290.09, 399.90 and 196.68 is: 271.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.09 : 399.90 = 196.68 : x
  2. Step 2: Convert to fraction form
    290.09/399.90 = 196.68/x
  3. Step 3: Cross multiply
    290.09x = 399.90 × 196.68
  4. Step 4: Simplify right side
    290.09x = 78,652.33
  5. Step 5: Solve for x
    x = 78,652.33/290.09
  6. Step 6: Final answer
    x = 271.14

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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.