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Finding the Fourth Proportional to 288.60, 398.46 and 222.09

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Solution

The fourth proportional to 288.60, 398.46 and 222.09 is: 306.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.60 : 398.46 = 222.09 : x
  2. Step 2: Convert to fraction form
    288.60/398.46 = 222.09/x
  3. Step 3: Cross multiply
    288.60x = 398.46 × 222.09
  4. Step 4: Simplify right side
    288.60x = 88,494.31
  5. Step 5: Solve for x
    x = 88,494.31/288.60
  6. Step 6: Final answer
    x = 306.63

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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.