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Finding the Fourth Proportional to 289.28, 398.85 and 226.92

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Solution

The fourth proportional to 289.28, 398.85 and 226.92 is: 312.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.28 : 398.85 = 226.92 : x
  2. Step 2: Convert to fraction form
    289.28/398.85 = 226.92/x
  3. Step 3: Cross multiply
    289.28x = 398.85 × 226.92
  4. Step 4: Simplify right side
    289.28x = 90,507.04
  5. Step 5: Solve for x
    x = 90,507.04/289.28
  6. Step 6: Final answer
    x = 312.87

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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.