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Finding the Fourth Proportional to 290.57, 400.31 and 216.74

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Solution

The fourth proportional to 290.57, 400.31 and 216.74 is: 298.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.57 : 400.31 = 216.74 : x
  2. Step 2: Convert to fraction form
    290.57/400.31 = 216.74/x
  3. Step 3: Cross multiply
    290.57x = 400.31 × 216.74
  4. Step 4: Simplify right side
    290.57x = 86,761.19
  5. Step 5: Solve for x
    x = 86,761.19/290.57
  6. Step 6: Final answer
    x = 298.59

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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.