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Finding the Fourth Proportional to 290.54, 400.61 and 216.73

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Solution

The fourth proportional to 290.54, 400.61 and 216.73 is: 298.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.54 : 400.61 = 216.73 : x
  2. Step 2: Convert to fraction form
    290.54/400.61 = 216.73/x
  3. Step 3: Cross multiply
    290.54x = 400.61 × 216.73
  4. Step 4: Simplify right side
    290.54x = 86,822.08
  5. Step 5: Solve for x
    x = 86,822.08/290.54
  6. Step 6: Final answer
    x = 298.83

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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.