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Finding the Fourth Proportional to 289.31, 399.42 and 178.88

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Solution

The fourth proportional to 289.31, 399.42 and 178.88 is: 246.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.31 : 399.42 = 178.88 : x
  2. Step 2: Convert to fraction form
    289.31/399.42 = 178.88/x
  3. Step 3: Cross multiply
    289.31x = 399.42 × 178.88
  4. Step 4: Simplify right side
    289.31x = 71,446.25
  5. Step 5: Solve for x
    x = 71,446.25/289.31
  6. Step 6: Final answer
    x = 246.96

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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.