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Finding the Fourth Proportional to 290.82, 400.19 and 289.02

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Solution

The fourth proportional to 290.82, 400.19 and 289.02 is: 397.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.82 : 400.19 = 289.02 : x
  2. Step 2: Convert to fraction form
    290.82/400.19 = 289.02/x
  3. Step 3: Cross multiply
    290.82x = 400.19 × 289.02
  4. Step 4: Simplify right side
    290.82x = 115,659.97
  5. Step 5: Solve for x
    x = 115,659.97/290.82
  6. Step 6: Final answer
    x = 397.71

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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.