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Finding the Fourth Proportional to 290.99, 401.20 and 212.25

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Solution

The fourth proportional to 290.99, 401.20 and 212.25 is: 292.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.99 : 401.20 = 212.25 : x
  2. Step 2: Convert to fraction form
    290.99/401.20 = 212.25/x
  3. Step 3: Cross multiply
    290.99x = 401.20 × 212.25
  4. Step 4: Simplify right side
    290.99x = 85,154.70
  5. Step 5: Solve for x
    x = 85,154.70/290.99
  6. Step 6: Final answer
    x = 292.64

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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.