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Finding the Fourth Proportional to 290.91, 401.23 and 212.21

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Solution

The fourth proportional to 290.91, 401.23 and 212.21 is: 292.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.91 : 401.23 = 212.21 : x
  2. Step 2: Convert to fraction form
    290.91/401.23 = 212.21/x
  3. Step 3: Cross multiply
    290.91x = 401.23 × 212.21
  4. Step 4: Simplify right side
    290.91x = 85,146.02
  5. Step 5: Solve for x
    x = 85,146.02/290.91
  6. Step 6: Final answer
    x = 292.69

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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.