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Finding the Fourth Proportional to 289.45, 399.16 and 178.91

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Solution

The fourth proportional to 289.45, 399.16 and 178.91 is: 246.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.45 : 399.16 = 178.91 : x
  2. Step 2: Convert to fraction form
    289.45/399.16 = 178.91/x
  3. Step 3: Cross multiply
    289.45x = 399.16 × 178.91
  4. Step 4: Simplify right side
    289.45x = 71,410.83
  5. Step 5: Solve for x
    x = 71,410.83/289.45
  6. Step 6: Final answer
    x = 246.71

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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.