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Finding the Fourth Proportional to 290.34, 399.69 and 216.54

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Solution

The fourth proportional to 290.34, 399.69 and 216.54 is: 298.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.34 : 399.69 = 216.54 : x
  2. Step 2: Convert to fraction form
    290.34/399.69 = 216.54/x
  3. Step 3: Cross multiply
    290.34x = 399.69 × 216.54
  4. Step 4: Simplify right side
    290.34x = 86,548.87
  5. Step 5: Solve for x
    x = 86,548.87/290.34
  6. Step 6: Final answer
    x = 298.09

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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.